.300 Blackout

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  • Last Post 23 September 2017
technojock posted this 07 November 2014

I have a .300 BLK H&R Handi rifle on order and I'd like to make some loads for it ASAP.  However I'm not finding a much in the way of load data for it.  Since the .300BLK isn't much bigger than the .30 Carbine, would it be OK to use .30 Carbine data as a starting point?

I have unique, red dot and 2400 that I can use and maybe a few others.  I have some 120g cast bullets meant for the .30 carbine and the I plan to use the molds I bought to cast .30-30 bullets to get me started.

Any recomendations?

Tony

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JeffinNZ posted this 23 September 2017

Jeff

Do you have any difficulty with fouling when using your suppressor with cast bullets. My 300 Blackout has a threaded barrel and my suppressor is on order so I am curious.

Jim     

 

Hi Jim.  I use a rather soft lube so the fouling is not so bad.  It generally wipes off fairly easily.  Alox was a different story. 

Cheers from New Zealand

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Scearcy posted this 23 September 2017

Jeff

Do you have any difficulty with fouling when using your suppressor with cast bullets. My 300 Blackout has a threaded barrel and my suppressor is on order so I am curious.

Jim

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technojock posted this 22 September 2017

I have one of those rifles too.  Mine is the one with the built in receiver peep sight.  I had it converted to K-Hornet many years ago but the smith that did the firing pin conversion was a moron and it broke after about 50 shots.  I still haven't gotten it fixed.  The plan now is when I get the firing pin fixed to rebarrel it to .256 Win. 

I've heard it before and agree that the .300 Blackout is a modern recreation of the .32.20.

I envy you in NZ for the no BS use of suppressors.  Hopefully that will change for us soon.

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JeffinNZ posted this 22 September 2017

I appear to be a man ahead of my time.  Nearly 20 years ago I have a .22RF Martini converted to CF and a SMLE barrel fitted to it trimmed to 18 inches fitted with an over barrel suppressor and chambered in .32-20.  It will shoot 100-220gr bullets at whatever I send them down range at.  Mostly it is loaded with 115gr at 1050fps for rabbits/hares or similar weight at full noise .32-20 fps. 

Rimmed Blackout.

Cheers from New Zealand

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OU812 posted this 22 September 2017

I have a Thompson Contender pistol/barrel chambered in 300 Whisper. Rifling is 1-10 twist and 8 grooves. Free bore length .200, free bore diameter .309.. This should work very well with lighter weight bore riding bullets...I hate too much recoil. 

Sorry I have never test this gun with cast.

300 Whisper brass is made by expanding 221 Fireball brass (thin necks). Chamber neck is cut smaller diameter.

300 Blackout brass is made by trimming down 223 brass (thick necks). Chamber neck is cut larger diameter

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Scearcy posted this 22 September 2017

I have a mold for a 230 gr Blackout bullet. It really hasn't worked out for me as I have very little interest in subsonic loads.  I am not sure what I was thinking when I ordered the mold. I have mostly used the 312 160 gr FN designed for the 7.65X39. In general short for their weight FN bullets have been the easiest to get to shoot well but of course they rarely feed well so the rifle is pretty much reduced to single shot status.

Jim

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technojock posted this 22 September 2017

When I first got the rifle, I tried 150g flat nosed bullets from the Mo bullet company but I couldn't get them to shoot straight.  I had better luck with 150g plated bullets but since then I have decided not to pursue larger game with it.  There's way too many coyotes around here but I only see them in town.  I've also had good results with 110g cast bullets meant for the .30 Carbine but off the top of my head I don't remember how much Unique I used...

The .300 Blackout is a good round for cheap shooting with cast bullets.  A friend sent me some seriously long powder coated bullets that must be over 220 grains.  I've yet to try them...

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Scearcy posted this 20 September 2017

Two  years ago when I was experimenting with the 300 Blackout, I tried 5-6 gr of 2400 behind a 130 gr FNGC. This load shot very well at 50 yards and ok at 100. I also tried unique which did not shoot as well for me.  The load utilizing 2400 was not subsonic but it did provide another level of power for slightly larger game. 

Since the 300 Blackout case is basically a handgun case as far as capacity I was always puzzled by the fact that a light load of 2400 shot better than what would be considered a midrange load of unique. FWIW

Jim

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onondaga posted this 20 September 2017

technojock

My 90 gr SWC load at 1160 fps in X39 does fine with gray squirrels and the black ones that are about 50% bigger here in WNY.. I can hit heads at 50 yards, but a chest vital works fine too. Our woodchucks topple at 50 yards too. Large snapping turtles heads are small but the load will go right through the shell too. I wasn't so lucky on racoon, one I hit with the load took 3 head shots to kill. It didn't surprise me though, they are tough to kill. I have also taken numerous Chipmunks with the load and they explode with a chest shot worse than with a .22RF HPs  The Coyote here are small for the species and I haven't taken one with the load yet, but I wouldn't pass up one at 50 yards. I generally hunt them with 12 ga cast "O" Buck anyway. The X39 squirrel load is exceptionally inexpensive and accurate for me and my Remington Spartan is a beauty with my show finish, trigger work and good optics.It has a 24" fluted barrel that is chrome lined and loves cast bullets better than jacketed.

Gary

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technojock posted this 20 September 2017

Unless they're more likely to stick with Alox, I think I'll continue to lube them. That way I can load them in warmer loads too without having to segregate them..  I went back and looked at the info my friend sent me and he was getting 900 FPS with 2.5g and 1050 with 3.0g of Red Dot.   Perhaps it would be better to up the load .5g?

The bore slugged out right at .308 and the bullets are .310.  The first batch of 50 I sized to .309 but now I don't bother.

I'm also considering these for squirrels but there aren't that many around Western Oregon... So for the most part I'm shooting paper and other plinker type targets.

 

Tony

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onondaga posted this 20 September 2017

 

technojock   That low of pressure/velocity doesn't need lube as lead is a lubricious metal by itself and you don't have enough pressure or velocity to stick it to steel at 760 fps unless your fit is small and they wobble down the bore. Try pure lead or reclaimed jacketed bullet scrap that generally is 98% Lead with 2% antimony and zero lube. That was recommended twice to me on this forum, but I didn't try that when I was working on my 7.62X39 squirrel load with the Lee 32 cal 90 gr SWC at 1160 fps with 2.9 gr TiteGroup because I wanted a velocity similar to 22 RF and my bullets hard enough to carry in the pocket for my single shot Remington Spartan, But If I went as low as you are I would shoot them bare and not worry. I tumble lube once for my squirrel load with White's Deluxe 45:45:10 and they are cast in #2.   Gary

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technojock posted this 20 September 2017

I recently bought a Lee bullet mold meant for .32 revolvers.  With the alloy I have on hand, it drops 87g .310" bullets.  I tumble lubed some and sent other out to a friend to be powder coated.  I started with 3 grains of Red Dot and worked down to 2.0 grains.  I've seen no signs that I'm going to stick a bullet in the bore and so far I've shot about 100 with 2.0g of Red Dot.  The accuracy is good at 50 yards but I don't recall the exact measurement of the group size.

The friend that powder coated some of them for me chronographed this load at 760 FPS.  I was trying for a quiet and subsonic plinking load and I think I nailed it.  I'm not sure how much 2g of Red Dot cost but I don't see center-fire shooting getting any cheaper...

While I haven't noticed any accuracy difference between 2.0 and 3.0 grains of Red Dot, my friend found that 3.0g gave tighter groups in his rifle.

Tony

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badammo posted this 10 August 2015

I have bought brass from this company and he has great service. 1000 pieces for $100. http://gcgbrass.myshopify.com/

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badammo posted this 10 August 2015

I have been using Lyman 311672 160 gr. gas checked. Round loaded with 15gr. H4198. It shoots very well, I havent chronographed it yet but it rings 8” swinger at 200 meters.

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onondaga posted this 02 August 2015

JHS Get more recommendations than just from me. My loads are with 7.62X39 that has more capacity than the 300BO.  TiteGroup is not fussy to case volume, So this will be close.

7-8 gr Titegroup gives me 1150 fps with the Lee 150 gr FNGC in 7.62X39 my Lee is honed to drop .3125". Try 6 grains to start in the 300 BO with a 170 gr bullet and use a chronograph.

Check with Hodgdon first. Email or call Hodgdon Technical. They frequently add loads using TiteGroup as they are highly promoting TiteGroup for its safe ignition characteristics in light charges. My most accurate light load for squirrel in X39 is the Lee TL314-90-SWC sized .312” with 2.9 gr TiteGroup at 1160 fps.

NOTE: barrel length is very relevant to velocity in the 300BO with TiteGroup. The Chronograph is really needed to start. My Remington Spartan single shot barrel length is 24” in X39. 

Gary

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Scearcy posted this 02 August 2015

GaryDo you have any thoughts on the load range for Titegroup with a 170 gr boolit?Jim

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358156hp posted this 01 August 2015

I've been looking at the Wilson 7.62X40 myself, but really want more horsepower yet. The 30 HRT looks good, but requires 30 Rem brass to make. 6.8 SPC might work, but I never compared the case lengths to make certain. The big problem is that 223 brass is cheap, 30 Rem brass is not, and nobody offers commercial 30 HRT brass.

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gpidaho posted this 31 July 2015

I'm really starting to like the 300 Blackout. I was a little worried at first about the 1in7 twist with cast but it hasn't been any problem so far. Most loads so far have been in the 1450-1700fps but just loaded a few 230s today with 12.8 RL7 will see how close these are to sonic tomorrow. My Rock River AR NEEDS a new upper, I'm kind of leaning toward the 30 Wilson, any of you have one? Gp

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onondaga posted this 30 July 2015

http://www.castbulletassoc.org/view_user.php?id=7904>JHS

Consider H TiteGroup for your 300BO. It has no ignition sensitivity problems at all, burns clean and Low ES throughout the range subsonic to MAX.

Gary

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Scearcy posted this 30 July 2015

I tested 4 different bullets with 4-5 different powders last fall.  I am not interested in subsonic so I was staying in the 1350 to 1500 fps velocity range.  I tried reloader 7 for close to 200 rounds.  I like it but think that it may be somewhat slow for the 300 BLK.  1680 did not work well for me and I have reserved H110 for jacketed bullets.  I also dabbled with unique and a few loads of red dot.  I finally settled on IMR 4759 after about 500 rounds.  While I was able to shoot an occasional 1” group, the last 75 rounds yielded an aggregate of about 1.5-1.75” with 3 different bullets (165 GR TO 185 GR). Well its a new year and 4759 is no longer available.  I am going to try AA9 (hard to get) and probably LT-30.  I still wish Rx7 had worked a little better but its very hard to get also.  I am out of 2400 but if I had it on hand, I would definitely try it. I guess I never said this, but I am shooting a bolt gun.

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