Muzzle brake issues - Graybeard Outdoors
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post #1 of 22 (permalink) Old 04-25-2019, 05:59 PM Thread Starter
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Default Muzzle brake issues

I bought a MB .after a few shots it was clearly evident some thing was wrong.gun was shooting a very large groops. Was about to throw it out .the thought was it had changed the harmonics of the barrel.

I looked into the MB and I wondered what would happen if I were to run a 1/2 inch drill bit through the first chamber . It helped a little bit .after that I cut the rest of that chamber and got a great groop
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post #2 of 22 (permalink) Old 04-25-2019, 06:27 PM Thread Starter
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this is what it did with MB


and after the fix
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post #3 of 22 (permalink) Old 04-25-2019, 08:08 PM
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Looks like serious food for thought! Nice catch!
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post #4 of 22 (permalink) Old 04-26-2019, 08:35 AM
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+ 1 with The Old Man. Swims got it right; change in harmonics. I have an H&R Topper that had groups blow up when I replaced the regular forend with a mannlicher. Full-length glass bedding and a soft rubber pad about two inches back from the muzzle finally solved the problem. Most of the accuracy problems I've run into turned out to be with the rifle. Except for changing to bullets that will stabilize, haven't had much luck tinkering with loads. My two cent's worth. Anyways, good post; definitely food for thought.
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post #5 of 22 (permalink) Old 04-29-2019, 08:22 PM Thread Starter
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I think maybe now I have a loading I can live with. I also now have a very loud gun . BTW always use hearing protection when shooting guns . 40.7 gr AA 4064 140 gr sierra btsp .
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post #6 of 22 (permalink) Old 04-30-2019, 09:28 AM
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Good looking group. One of the downsides to muzzle breaks is increased flash and noise.
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post #7 of 22 (permalink) Old 04-30-2019, 10:19 AM
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I had the same results after having a brake installed, first try 12" group at 100, First they had forgot to patch out the bluing salts groups still 1.5 at 100 was the best I could get at the bench, still not happy I later found a savant ( hope that's how it is spelled) he looked through it and found a groove almost full length in the bore of the brake he believed from the installer using a drill press to open the break to caliber. He corrected the out of round and groups went back to less than an inch at 100 took two years to get it right

Last edited by SEM; 04-30-2019 at 10:21 AM.
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post #8 of 22 (permalink) Old 05-01-2019, 08:29 AM Thread Starter
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I feel fourtunet that I have a lathe so that I can do these tricks .
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post #9 of 22 (permalink) Old 05-01-2019, 10:20 AM
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Quote:
Originally Posted by swim-with-beavers View Post
I think maybe now I have a loading I can live with. I also now have a very loud gun . BTW always use hearing protection when shooting guns . 40.7 gr AA 4064 140 gr sierra btsp .
burn rates of powders
http://www.accuratepowder.com/wp-con...burn_rates.pdf
have some effects on a muzzle break accuritcy since a slower burn rate as AA 4064 is slower, then imr 4064 i use both in my 308 20 inch barrel and found out the imr groups seen seem to be wider

Last edited by sagia308; 05-01-2019 at 10:23 AM.
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post #10 of 22 (permalink) Old 05-03-2019, 06:33 AM
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buddy had one of those browning abolts with an adjustable break. Amazed me how much fine tuning that break would do. difference in 2 inch loads and sub moa loads. cool thing was you could almost skip load development. you could tune that gun with that break to shoot about any load exceptably well.

MAKE AMERICA GREAT AGAIN! STEEL FOR TANKS NOT FENCES!!!
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