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barrel diameters and muzzle brakes.

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Old 05-20-2014, 10:59 AM
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Join Date: Jul 2004
Location: Texas
Posts: 5,878
Re: barrel diameters and muzzle brakes.

In an earlier post I stated I had repaired barrels that had shot the brake off for one reason or the other. (That is one of the reasons).

Just because "some" others have not had a problem doesn't mean I want to do it.

Muzzle brakes are a relatively new addition to rifles (I personally did not like or use them until
a few years ago when I realized the advantages they offered) Most rifles over 10 to 15 years old
do not have provisions for threading the barrels because they were not designed to attach anything to the muzzle, so barrel wall design thickness was based on finished barrel thickness.

A site sponsor that is one of the best gunsmiths, mentioned to me that he remembers while going to Gunsmith school he was told 'when drilling and taping site base holes in barrels never to go deeper than necessary and to leave .150 thousandths of barrel from the bore to the bottom of the drilled hole.

I looked in some of my gun Smithing books and they recommended the same thing.

I worry about the do it your self people that do not know there are minimums and could get into trouble. The gun smiths should take care of things like this (That's why you hire them).

As we are more and more into tactical firearms you will notice that none of the .308s have 1/2x28
threads (Most are 5/8x24) the , .223s still use the 1/2x28 because they can.

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Old 05-21-2014, 12:52 PM
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Join Date: Apr 2003
Location: North Bend, Oregon
Posts: 1,330
Re: barrel diameters and muzzle brakes.

Originally Posted by stenger View Post
I have seen a lot of rifles use 1/2 inch brakes. Anyone ever have a confirmed problem with a. 308 cal brake with a 1/2 dim thread that the root cause was a thin wall!
I do a couple a week in 1/2-28. I use 9/16-24 when I can but many people do not like the look of the fat brake that goes with it. I would say hands down our most popular installation. Rem or Win sporters in 300 RUM. Followed by those skinny barreled Rugers in 7mm and 300 Win mag. It used to concern me but they have stood the test of time.
Build a man a fire and you heat him for a day.
Set him on fire and you heat him for life.

Only accurate rifles are interesting.

Gordy and Brady.
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Old 05-27-2014, 08:09 PM
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Join Date: Dec 2009
Location: LaPine Or.
Posts: 2,527
Re: barrel diameters and muzzle brakes.

Originally Posted by FEENIX View Post
This is another excellent info and should be on the "sticky".
"Its not Rocket Surgery.....'

"I have No idea why that cop made me ride in the back seat, when I Clearly called Shotgun!"
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Old 05-28-2014, 12:15 AM
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Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,405
Re: barrel diameters and muzzle brakes.


It's been ages since my navy metallurgy training.

IIRC the term is nil ductility transition point. That beyond which plastic deformation occurs.

Just though I'm chime in. . .
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
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