A Chronograph Conundrum

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Eutectic posted this 14 June 2024

A nice bright sunny day with a dozen 9mm cast loads to chronograph. Nothing is working right. First screen reports missing the shot. Last screen reports no shot. Chrono sees nothing on some shots. Wild velocities reported. Checked all the connections, problems still exist. Standard velocity 9mm test ammo gives variable results - some correct. Jacketed 9mm not any better. Muzzle blast problems? Moved screens, more variation. Using up limited test ammo, not enough good data for standard deviation determination. Pulling out hair, not much hair much left.

Tried 22 LR pistol to try trouble shooting. Cheaper and lots of 22 ammo. Chronograph gets religion, all shots record perfectly, velocity is correct.??????

Dark colored 22 bullets record perfectly. Nice shiny cast bullets are awful, jacketed 9mm not much better.

Solution: Magic Marker on nice clean cast bullets. They look ugly, chronograph likes them.

The shiny bullets show no (or low) change in light intensity over the photo cells.

Problem solved, hair will grow back (I hope)

Steve

 

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fc60 posted this 14 June 2024

Black Magic Marker.

Got to love that one...

I have read about "glints" on the various chronograph websites.

Spoiled with my LabRadar. Rain, sleet, snow, nor dark of night. Or, was that the Mailman?

Cheers,


Dave

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Tom Acheson posted this 14 June 2024

My first Garmin Chronograph experience was at a CBA match on Monday. It was good! The rifle is a Rem Rolling Block chambered in .38-55. A friend has one and he had a few of us try it out. You just set it on the bench next to barrel area of the rifle. I had been estimating a mv of 1400. Turns out the 10-round average was 1152.8. At the next match I plan to use it for my XP-100 in .22 BR.

For a while I owned (3) Chronys. Haven't used any of them for maybe (10) years. Recently I threw two out. It becomes annoying when you set your screens up and have to adjust them, and the other shooters on the line don't like the interuptions your are causing to make your adjustments.

The Garmin unit costs about $600 but it is much more user friendly. Someday maybe....

Tom

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Ken Campbell Iowa posted this 14 June 2024

black lead measures

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John Carlson posted this 14 June 2024

I hardly ever have problems with either the prochrono or the caldwell.  I do use the difuser screens though I have seen others have success without them  Possibly because I'm shooting longer rifle bullets.

John Carlson. CBA Director of Military Competition.

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Shuz posted this 14 June 2024

I have an Oehler 33 with sky screens mounted on a 6 ft  piece of aluminum channel that I  have been trying to sell locally for $100.00. I have not had a single bite. It works perfectly, but since I had to move away from my own range, it is too cumbersome to try and use at a public range. 

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Wilderness posted this 14 June 2024

I have a 1980 Oehler 33 with Skyscreen II. I had some early issues when the sun was overhead, fixed with diffusers made from white plastic oil bottles.

Then I had one instance of complete failure to read with some powder coated 190 gn Lee .30" bullets I was given to try. They were a shiny copper colour. Otherwise I've only used lubed rifle bullets and copper jacketed bullets. I do pick up some ERR readings from the shooters beside me.

Agree re Garmin after trying one a few weeks ago. Readings were slightly higher than the Oehler, but consistent with the difference between muzzle (Garmin) and 12.5 feet (Oehler), and no missed shots. The Garmin and the Oehler in this test were being used together.

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Ed Harris posted this 14 June 2024

When I was at NRA and later at Ruger I used a carbide lamp to smoke the bullets. Worked like a charm. Made shot holes in targets Frasier to see too.

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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Mal in au posted this 14 June 2024

Bought a Garmin 3 months ago, flintlock,22 PCP, Rim, 30/222 ,.303,308 ,40/65 45/70 all lead pils,not one missed shot during that time, $1100 au  here in OZ. Best K and a bit I have every spent on shooting gear. So easy to use.   Mal in au.

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Aaron posted this 15 June 2024

I think we all have that special chronograph day on the range.

 

 

With rifle in hand, I confidently go forth into the darkness.

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Eutectic posted this 15 June 2024

I never had glint problems this bad before, must have been a special day.

I have owned two Chronys, still have one. They are nice and easy to set up. The Oehler 33 is my main research machine. I have owned it for ~ 30  years. Repairs - wore out the printer, an easy replacement from Oehler. The diffusers work great.

Nice to know the Garmin is good equipment, but the cost is a bit much.

Steve

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John Alexander posted this 15 June 2024

I have a LabRadar which is a radar like the Geamin with nothing needed in front of the shooting bench. It also works well once you learn its limitations, and also has a high price.   It does eat batteries.

I would like to see a comparison.  Even better I would like to see a third competitor offering on at a much lower price.

John

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Eutectic posted this 5 weeks ago

I just looked at the Labradar site. They have a new model coming out, the LX. It is small like the Garmin and similar features. Looks like competition is working. Maybe the price will come down.

I am with John, is the advantage of simple set-up worth the price since I have a perfectly working chronograph?

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Paul Pollard posted this 5 weeks ago

https://www.amazon.com/s?k=Portable+Charger+38800mAh%2CLCD+Display+Power+Bank%2C5+USB+Outputs+Battery+Pack+Backup%2C+USB-C+in%26out+Dual+Input+Phone+Charging+Compatible+with+iPhone+15%2F14%2F13+Pro+Max%2F12%2CAndroid+Samsung+Galaxy+Pixel+Nexus

John,

I ordered my Labradar with a power pack which connected with USB cable. It quit holding charge after several years, so I ordered this from Amazon.

 I have never used batteries. 
Paul

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cowdude posted this 4 weeks ago

The trick with the Magic Marker on the cast bullets is pretty clever, though. Sometimes you just gotta improvise to make things work. 

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