BENCHREST SHOOTING OPINIONS

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joeb33050 posted this 21 January 2021

BENCHREST SHOOTING OPINIONS

Summary:

 Cleaning does not affect group size, and no “lube seasoning” is required.

 There is a lot of variation in group size. About 100 groups must be fired, measured, and averaged to make any reliable conclusions.

  Some group size variation is caused by the rest.

  Wind affects poi little or not at all at lower wind speeds. Shooters cannot offset the poi to precisely correct for the wind at any wind speed.

 About cant and bubble levels

 Changes in temperature moves the poi.

 

  Frequently, larger groups are caused by several flyers rather than one flyer.

 

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All data is for 5-shot 50 yard groups unless otherwise noted.

Opinions are based primarily on shooting data for four 22 rimfire rifle after 2/1/2020.

I suspect that some of the findings/opinions here apply to center fire cast bullet shooting.

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 Equipment and groups

Since 2/1/2020:

CZ 457 MTR-315 groups

BSA 12/15-150 groups

Winchester M 52, pre A-170 groups

BSA International, MK II-140 groups

Total: 775 groups

Scopes: Weaver T36, two, T36XR, 1

 

Also, since 2/1/20:

Mossberg 44US-70 groups

Remington 513t-40 groups

Ruger Charger, Kidd barrel and trigger-50 groups

Total: 160 groups

 Between 2017 and 2/1/2020

 

Charger-604 groups

Rem 513t-264 groups

Mossberg 44 US-200 groups

Win 52, pre A-115 groups

Total: 1183 groups

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RicinYakima posted this 21 January 2021

I agree with most of your opinions. However having shot BR-50 for several years, I would say the wind does not affect POI very much at only 50 yards. However, a 10 MPH wind gust from the side, common here in the desert, will move a bullet almost a whole bullet diameter. You are very astute to note that the rest itself can change group size if not use consistently.  

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joeb33050 posted this 22 January 2021

Group size is not affected by barrel cleaning, nor are “barrel lube seasoning” shots required.

Some contend that several to many shots are required after cleaning or after changing ammunition before the bore is “seasoned” and accuracy is restored.

I clean every time I shoot a gun because of the very high humidity here in Florida; and my fear of rust.

After 100 record shots, 22LR, cleaning by pulling a .17 caliber brush with a paper towel patch ~ 3/4” X 2”, with CLP, the fourth to fifth patch is clean.  

I remove the scope after shooting, put a scope on the gun before shooting. This remove/replace requires checking and/or re-setting the scope settings before going to the record target.

I fire a shot at the center of a blank piece of paper, follow that with five aimed at the first hole. Adjust the scope-to the record target and fire 10 five-shot groups for record.

I have watched these initial 5 shot sight in groups and noted that their group size is representative of the average of the next 10 groups. Recently I have saved and recorded the results:

 

Starting with a clean barrel, aiming at the center of a blank piece of paper:

11/6/20, CZ457MTR, SHOTS 1-5 IN .5", THEN 10 GROUPS AVG .475"

11/15/20, WIN 52, SHOTS 1-5 IN .8”, THEN 10 GROUPS AVG .485”

11/23/20, WIN 52, SHOTS 1-5 IN .3”, THEN 10 GROUPS AVG .478”

11/25/20, CZ457MTR, SHOTS 2-6 IN .7”, THEN 10 GROUPS AVG .463”

12/14/20, CZ457MTR, SHOTS 2-6 IN .6”, THEN 10 GROUPS AVG .623”

1/1/21, CZ457MTR, SHOTS 2-6 IN .475”, THEN 10 GROUPS AVG .545”

1/15/21, WIN 52, SHOTS 3-7 IN .4”, THEN WENT HOME, TOO WINDY

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John Alexander posted this 22 January 2021

Funny how often things we believe about shooting turn out to be doubtful at best and sometimes flat out wrong -- if we shoot lots of groups, and don't disregard ANY of the groups or shots fired, even if we don't like them, except for the occasional shot called bad before looking at it .

I think that's because we forget that groups, even ten shot groups, vary a lot from one group to the next and we usually draw conclusions based on one or a few groups. The technical term for this is "chasing your tail."

The other reason is we have a natural tendency to disregard information that doesn't confirm to our ideas of what a bullet ought to "logically" do. 

John

 

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Tom Acheson posted this 22 January 2021

It is good to see that this subject is clearly identified as a collection of opinions. Here are two other opinions.

I’ve shot at CBA BR matches. Listening to and talking to shooters in the Plain Base Bullet category I’ve heard comments like “I had to aim at the far edge of the target paper to get the bullets to end up near the middle of the target”. This was at 200-yards but to a lesser extent for 100-yards, but still a decent hold-off there. The PBB category does not permit the use of gas checks so the muzzle velocities need to be kept slower than other gun categories. Even so, other gun category shooters experience negative influences of wind. A friend of mine once commented after I told him I was out the day before a match doing some load testing. He said “If you didn’t use your wind flags you were wasting your time and components”. Wind DOES influence bullet point of impact.

Bench technique is too often overlooked. Inconsistency here will negatively influence your results. This includes alignment of the rests with the target area down range, positioning of the rifle in the two rests being the same for each shot, the rifle moving across both bag rests the same for each shot, the shooter’s body contacting the rifle during the shot the same for each shot, trigger management, consistent follow through at the end of each shot, shooter awareness of the ever changing environmental conditions while shooting is taking place and adjusting to those variables, etc. Shooter health, mindset and mental attention to details also enter the picture. A shooter is not exactly the “same” person every shot.

FWIW

Tom

 

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4and1 posted this 23 January 2021

Good post Tom. Wind does indeed effect bullet impact. When I started shooting benchrest, I would attend the cast bullet matches, pay the fee, and shoot for the practice. I would set out my flags. There was not a single cast shooter at that time using flags. I would watch shooters run their targets in switchy wind, complete reversals, and their bullet holes were scattered from one side of the bull to the opposite side. Slowly some shooters started putting out flags.

Bench technique is real, we call it table manners. That's why guns built for bench shooting are made the way they are, 3" forearm, adjustable front rest, rear bag, and 2 ounce triggers. Free recoil. A stock that tracks straight. Cast bullets are slower, barrel time is longer. I can tell the difference between shooting a 13.5 pound gun and a 10.5 pound gun. Small things make a difference.

Temperature makes a difference. Perhaps not in the gun itself per se, but the load. Mornings are cooler the air is denser, by noon things are different. Same is true with the light. There is a difference between shooting in full sun, and then a big cloud comes by.....And then there is mirage.

I personally clean my gun after every target. When I shoot a target, I want to know my barrel is as close to the same condition each time, not an accumulation. 

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joeb33050 posted this 23 January 2021

here is a lot of variation in group size.

There is a lot of variation in group size. About 100 groups must be fired, measured, and averaged to make any reliable conclusions. These groups should be fired at ~ 10 groups per day, on ~ 10 different days. The following tables/graphs show the results, each “dot” on a graph is a 10 group average.

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TRKakaCatWhisperer posted this 23 January 2021

You mention powder temperature.  Good.  In the artillery, powder temperature is MEASURED.  It is one of the factors in calculating the azimuth and elevation to get the rounds to the right place. 

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Squid Boy posted this 23 January 2021

Interesting data and there seems to be a trend in the group size opening up as the shooting continues. It also seems to hold across all the different guns tested. Any idea as to the factors that might be causing this? Where the barrels cleaned between sessions? Changes in weather conditions? Anything? Thanks, Squid Boy

"Squid Pro Quo"

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John Alexander posted this 23 January 2021

What does the horizontal axis represent?

I nothing, are these are just ten different days that you have arranged in order of group size?

Thanks.

John

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joeb33050 posted this 23 January 2021

The 10 group averages are sorted, numbered, and graphed. I have not been able to ascribe a reason to the variation in group size. All guns are cleaned as described at the range after shooting. There is no trend I can find in time, and time between 10 group sets varies from minutes to months. 7550 record groups in < 1 year.

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Squid Boy posted this 23 January 2021

That's a lot of shooting and there is certainly something going on. Interesting that the biggest jump in group size for the CZ and the two BSA's seems to occur at the 9th group. I don't know if you shot all those rifles on the same day but if you did certainly something must have happened. My math isn't the best but I tried to run a standard deviation for the 15 groups out of the Rem 513T and came up with .044". I was trying to test various brands of 22's in my own Martini but C19 and the run on ammo put an end to that. Thanks for sharing your work, Squid Boy

"Squid Pro Quo"

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Ross Smith posted this 24 January 2021

Looks like maybe possibly could be shooter fatigue?????

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joeb33050 posted this 24 January 2021

Some variation is caused by the rest.

Accuracy is affected, decreased, by the rest, by the bags. The gun recoil is affected by pressure of the bags on the gun during recoil.

The gun must recoil straight back, it cannot curve or feel any pressure sideways from either front or back rests. If the gun feels any pressure, right or left, from the rests; then the shot will be off.

If the front rest/gun are free to rotate; then the front rest is not contributing to inaccuracy. There will be no pressure on the gun by the rest.

If the rear rest is free to rotate on ABOUT the pivot point under the front rest; there will be no pressure on the gun by the rest.

I have been working on rests for years, attempting to meet the above conditions.

A sled and a flat top rest works, but not well enough so far.

 

If there is no front bag, it can't exert pressure on the barrel. 

The latest contraption. The front rest top is free to rotate, the forward two  screws fit in the crack between 2 table boards, the rear screw adjusts elevation.

 

The rear rest board has a screw through to fit in a crack between 2 boards, and pivots on that , adjusting windage, 

or

I had a problem in the past with poi changing as the point of aim changed, moving from target to target.

This problem went away as the rests were improved.

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joeb33050 posted this 24 January 2021

Notes:

Fatigue: For a while I shot two sets of ten 50 yard 5-shot groups per trip to the range. This shooting required a lot of concentration- it is hard work. I found myself wanting the last few groups to be over. I never found an increase in the second ten group size, but went to one set of ten groups per range trip. This gets me done shooting before the advice starts.

 

Statistics: For the 775 groups so far, 1/24/21, the average 5-shot 50 yard group size = .491”; this with four lot numbers of GECO SEMI AUTO; one lot of which is less accurate than the others. The standard deviation is .148”, thus the standard deviation/average, the CV, is .30. This compares with the Normal model CV of .27. This may be boring, but substantiates all the other boring stuff I have written about group size statistics.

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Squid Boy posted this 24 January 2021

JoeB, not boring at all to me. I have been considering problems in my rest system for some time now but have not acted on it. This has motivated me to look more closely at the parts and how they might affect the shot. waiting for some warmer days. Great stuff, Squid Boy

"Squid Pro Quo"

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John Alexander posted this 24 January 2021

Keep the "boring" stuff coming Joe. Some of us are very interested.  I takes all kinds of interests in different aspects of shooting to make up the CBA, or a good forum.

We don't have to read the posts we're not interested but  that doesn't mean that we shouldn't respect each others interests.

By the way have you taken a look at what the 22rf shooters are using for rests to shoot groups in the 0.5 moa range with the fancy ammo that costs more per shot than a dozen CB loads?  I know we have at least a couple of that type lurking here. 

John

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joeb33050 posted this 25 January 2021

Wind affects poi little or not at all at lower wind speeds. Shooters cannot offset the poa to precisely correct for the wind at any wind speed.

 Wind blows bullets around. Poi offset varies with wind speed and direction. We know, or think we know, that.

 

 My wind rule is: If wind gusts blow stuff around on the bench, I quit shooting.    

 

For 30 years or more, I have, when the opportunity presents itself, fired a shot while aiming center as the wind blows. The overwhelming majority of the shots, rimfire or center fire, hit within the group. There has been no connection between wind speed or direction and poi.

 I conclude that: In reasonable wind conditions, wind effect on group size is indistinguishable from other effects.

 

 I do not believe, nor have I found any evidence or reports to support the notion that, shooters have the ability to observe wind flags/conditions and calculate the effect of the wind on the bullet.

 

 Some shooters put up wind flags, get information from those flags, and act on that information.

 

 Some of these shooters wait for “no wind”, then fire at the same point of aim.  This may increase accuracy.

 

 Some shooters wait for “the same wind conditions”, adjust the sights to those conditions if shooting a score match, then fire at the same point of aim.

 

 Some shooters get wind information, compute the offset required, then fire at that offset point of aim.

 

I have yet to find a practical method of comparing wind-corrected and not-wind-corrected groups, or the ability of shooters to correct for wind. They say the do it, but offer no proof. I do not do it, and bullets hit within the group, most times.

 

 If a wind correcting shooter and a machine rest were set up with two accurate rifles, on a windy day, and both guns fired at the same time; then we could measure the effect of wind correcting. The practicalities are daunting. Yet we believe that wind correcting works, without evidence. There is a lot of that going on. 

I have CBA NM data with graphs from 1995 to 2019, and have noted that group size has not fallen much if at all over those years. There is a lot of variation in group size from year to year. I suspect that a lot of this variation is caused by wind. 1998/2002/2007/2012 much wind? 1996/2000/2003/2008/2010 little wind?

If so, shooters do not correct for wind very well?

 

 

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joeb33050 posted this 25 January 2021

I forgot this picture of screw adjustable windage adjustment on the rear bench rest.

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joeb33050 posted this 26 January 2021

Temperature change moves poi.

 

I found that my rimfire groups got higher on the target as I shot, quite noticeably. In the Florid heat I keep guns and ammunition inside the house, in the A/C, fearful of rust and degradation.

Figuring that the group rise was caused by the colder guns and ammunition getting warmer at the range, I kept the next gun and ammunition in the garage overnight, no A/C. This worked, the height increase went away.

Fall happened, the next gun and ammunition were kept back indoors. The first cool morning, warmer guns, and ammunition, to the range. The groups marched upward again, yes upward, as gun and ammunition warmed up. And repeated.

Groups rise as temperature changes up or down.

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joeb33050 posted this 27 January 2021

About cant and bubble levels

“Cant” is the rotation of the gun about a/the long axis, cant is when the horizontal crosshair is not level.

Cant right moves the poi a teeny bit down and a lot right.

Canting a gun does NOT cause inaccuracy, some offhand shooters cant the rifle a lot. As long as the cant is the same for each shot, accuracy does not suffer.

Some shooters mount bubble levels on the gun or scope; I have several. Centering the bubble adds another task to the multiple tasks required to shoot from the bench, and is not necessary.

 My testing showed that people have the ability to see cant of less than 1 degree, most of the time; and that this ability is enhanced with a horizontal reference, such as a horizontal crosshair on a scope.

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joeb33050 posted this 28 January 2021

Frequently, larger groups are caused by several flyers rather than one flyer.

There are at least four flavors of group size.

First is the round group of any size.

Second is the stringing group, with bullet holes wandering away in a line.

Third is the group with a flyer.

And fourth is my topic here, the group that has more than one flyer. Sometimes the second shot is far from the first; one, I thought, one was a flyer. But sometimes the following shots just made the group larger. I thought it was me, giving up on the group and not paying attention. So I paid attention, and now and then big groups with more than one flyer and no stringing showed up.  Is it likely that several small groups would be followed with two or more defective cartridges? I think not. But it does happen

See the arrows for examples.

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Ken Campbell Iowa posted this 29 January 2021

here are some pics of the rest type we used in ARA bench ...here the rifle is nested on the top plate and is not removed during the target ... ARA is 25 or 50 shots on a score target, so wallowing a 2-piece rest around for 50 shots was mostly disastrous .  each shot moved the rifle back about a 1/4 inch and was pushed back against a front stop after each shot.  carefully.

the rifle is held on the top plate, and the bottom plate is stuck into the bench with sharp micro-carbide tips, needle sharp.  the top plate at the front is dead tight on a tapered vertical pin for windage, and is " bent " for elevation by the rear adjust screw.  the forend of the rifle has a delrin plate pillared into the bottom for sliding in the front assembly of the rest.  the tail of the gun slides on ceramic or delrin balls .  windage of the top plate is from the rear horizontal screws, all top plate adjust screws run in zero-slop delrin bushings and the top slide is spring-loaded against the windage adjust screw.  these weighed about 25 or 30 pounds 

over a couple of years we built 5 or 7 of these for ourselves and some friends.

in our indoor 50 yard range we shot a lot of test targets, and went through about 6 cases of Federal, Eley, and Lapua match ammo.  

here are some of my opinions:

using barrel tuners ... the best ammo shoots best in all guns.  the lot numbers are more important than the mfg., amongst the top 3 . ......  ie, you can't test good ammo without a barrel tuner.  a group that is 5 shots strung half an inch up and down might go into one hole if you move the tuner 0.004 on a 1 inch diameter 20 inch long barrel.  geeze .   different tuner settings on the same test target gave about 1-to-3 group size differences.  also group shape and group center.  geeze.

shooting ARA , with the same ammo, is a wind shoot ...  btw, wind doesn't flow straight ... it swirls kinda like your shorts in a washing machine .. watching the flags on the next bench over is suicide ...

all rifles that i shot .. starting from " shooters shoot " ... needed 5 or 20  shots to establish their new zero for that target ...  some would start at their eventual zero and walk off and back .. some would move during these sighters and stay there if you shot at least one shot every 30 seconds.  hot days or freezing days , so it isn't " air temp " ... it is some kind of " barrel conditioning " .

for fun, on my ARA rest one day i shot 20 some shots of winchester wildcat without aiming ... under 1/2 inch at 50 yards.  

of course i sold that rifle ...  ( g ) ...

22 bumblebees ... too short, too soft, not enough rifling grip, heels get deformed on firing ... shouldn't fly.... 

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ray h posted this 29 January 2021

Ken since you're using a tuner on a rim fire, have you tried one a center fire with cast??

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Ken Campbell Iowa posted this 30 January 2021

hi ray ... no, but several mj benchresters use tuners .  easier to change a tuner than loads .

but ... in my opinion ...  the tuners are more of a fine-tuning device .. it changed the group size by 3 to 1 but these were rifles that shot well under 0.8 moa  for 50 shots  at a set ...in wind, and in timed matches ( oh, for record too ( g ) ) ...  i do suspect a tuner would reduce a 2 moa deer rifle to a 1.7 moa deer rifle ...  until the temperature and humidity changed ,,,

when i joined CBA in the 80's i tried all the tricks in my factory coyote rifles and got a few 1 inch groups ... a few ...  and was pretty happy ...  my brother/business partner passed away and 18 hour work days discovered me ...  so that was the peak of my fine accuracy efforts in cast bullets .. i burnt the candle at 3 ends in the ARA bench game for 3 or 4 years, and when my candle was gone i now have a ball shooting nostalgic old guns with cast plinkers ... but when i get rested up i intend to build a rifle so accurate it will probably be outlawed in competition ... 

then that rifle will have a tuner on the barrel.

ken

 

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ray h posted this 30 January 2021

Thanks Ken, I have one of Butch Lamberts tuners I bought years ago but never installed. I may just try it on the Zipper I just had barreled.

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JohnForrest posted this 05 September 2021

Interesting discussion, wish it would continue. From the point of view of a new guy seeing where I might evolve too.

Wondering about a good 22 to start working on my shooting  technique?

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David Reiss posted this 05 September 2021

John,

You can't go wrong with the CZ .22's, they are well made and accurate. I know where there is a 457 Varmint MTR that is new you might get a good price if you are interested. 

David Reiss - NRA Life Member & PSC Range Member Retired Police Firearms Instructor/Armorer
-Services: Wars Fought, Uprisings Quelled, Bars Emptied, Revolutions Started, Tigers Tamed, Assassinations Plotted, Women Seduced, Governments Run, Gun Appraisals, Lost Treasure Found.
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Ken Campbell Iowa posted this 05 September 2021

if you wind up with a CZ, be careful if you are married ...  

might be best if you kept it in a storage unit  ...

ken

or i guess a guy could put a Ruger boat paddle stock on it and take a file to the barrel finish ...  then tell her you got it from one of those swamp 'gator trappers ...

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Ken Campbell Iowa posted this 05 September 2021

or if a guy was serious about 22rf, you should contact Brian Voelker, he is about a half hour from you ...  then listen real good ...

ken

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OU812 posted this 06 September 2021

I develop loads using a bipod and a block of wood. Using one screw to attach block to wood shooting bench. One screw will allow the 2x4 to pivot when bipod legs are pressed against it. Rest the bipod (non swivel) legs to back side of block using consistent shoulder pressure and leaing forward against block before firing. The forward pressure takes alot of the human error away and crosshairs will be more steady and settled down.This method works great with my freefloated Remington HS precision stock. Some rifles, especially ones that are not freefloated do no shoot well using bipod.

Steady consistent shoulder pressure helps.

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Bud Hyett posted this 06 September 2021

First, the recommendation for a CZ rimfire is very good, they are the best for an out-of-box buy in today's market. I've seen both .22 LR and .17 HMR rifles shoot very well. The other brand to consider is the Savage bolt rifles. Alice won one at the CBA Nationals that will put ten shots under an inch with Eley Ten-X. 

I am stuck in an old paradigm, I always wanted a BSA Martini International. I shot one at the University of Illinois rifle team and loved it, but they were then outside of my budget. I now have three, two with Redfield 3200 scopes. They shoot well, ride the bags well and win. These are on the used market and still reasonable in price.  

Farm boy from Illinois, living in the magical Pacific Northwest

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OU812 posted this 06 September 2021

My heavy hart rest has a forward stop adjustment screw built in. I can apply more consistent forward shoulder pressure using it, but the rest must not move or slide forward when doing so. I hate carrying that heavy thing to the range, so I use a bipod and wood block instead. In competition, a good heavy shooting rest (with forward stop) that does not slide forward is the trick.

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Ken Campbell Iowa posted this 06 September 2021

along with the beautiful CZ 22 line, and yes the exquisite Martini,  .... in that budget area, look for a Sako Finnfire ....  the sporter barrel, not the heavy barrel ...  for some mysterious reason the sporters shoot better  ...

oh, i forgot to mention Brian Voelker is mostly a Remington guy, better not mention you are thinking about a CZ ...

ken

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OU812 posted this 06 September 2021

Here is the forward stop of hart rest. Mine is a little different older model. It is a Heavy .......! 

Consistent forward shoulder pressure takes away LOTS of jittery human error. More so than a heavy rifle will. BUT not all rifles like this technigue, mostly rifles with freefloated barrel it works well.

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OU812 posted this 06 September 2021

When using shoulder to apply forward pressure, you must prevent rest from sliding forward. How you do this legally in competition is up to you. If shooting on wood bench, you could hammer in spikes to prevent slipping. If shooting on concrete table maybe you could use some type of mat to secure rest.

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OU812 posted this 06 September 2021

My favorite rifle, Remington model 700 chambered in 223 Remington 1/12" twist barrel shooting soft "squished" 80 grain Alaxander bullet, 5-6 grains of Titegroup powder. Thats right " i said 1/12" twist factory barrel".

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Ross Smith posted this 07 September 2021

Ok, I'm confused as usual. I use free recoil like many others. Is there a reason that 22lr shooters use shoulder pressure?

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joeb33050 posted this 07 September 2021

Ok, I'm confused as usual. I use free recoil like many others. Is there a reason that 22lr shooters use shoulder pressure?

 

Serious 22RF shooters shoot free recoil, shoulder pressure left with the Oldsmobile. See Rimfire Central.

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45 2.1 posted this 07 September 2021

Joe-

   Since you've mentioned free recoil, I would like to see what your rifles do in a machine rest. Otherwise, is it you or the rifle and ammo that's restricting accuracy.

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RicinYakima posted this 08 September 2021

Free recoil is only useable with rifle with trigger pull light enough not to move the rifle. Military rifles pretty much require enough shoulder to have the trigger break without moving the rifle.

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Shopdog posted this 08 September 2021

No real dog in this but.....

I'd learn to control,and ideally lower your pulse rate. Plenty of written word on the subject.

Short story is a widowmaker heart attack left me with a low 40's pulse rate a few years ago. A great day sees it low 50's. The one bright point is how this has effected my shooting. Would say it's the cheapest,and one of the quickest ways to better scores....assuming reasonably competitive equipment.

Good luck with your project.

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Tom Acheson posted this 08 September 2021

I can recall reading several times that Olympic Biathalon athletes could intentionally lower their hear rate right after removing their skies and getting into position to shoot their .22 rifles. It has to be a difficult but an acquired skill.

Tom

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Ross Smith posted this 09 September 2021

Thanks for the free recoil answer joe.

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Bryan Austin posted this 10 September 2021

Maybe I should bring this back out?

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Bryan Austin posted this 16 September 2021

Looks like maybe possibly could be shooter fatigue?????

 

That's my excuse BEFORE the first shot!!! I am out of breath just setting up the target. cool

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