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Thread: Muzzle brake clearance

  1. #1
    Join Date
    Feb 2006
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    Question Muzzle brake clearance

    Bought a PVA shock wave Muzzle brake . 7mm bore ,bought the 30 caliber brake. It measures .332 ,is that to big for a 7 mm bore ?

  2. #2
    Join Date
    Jul 2016
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    Quote Originally Posted by Worker View Post
    Bought a PVA shock wave Muzzle brake . 7mm bore ,bought the 30 caliber brake. It measures .332 ,is that to big for a 7 mm bore ?
    No, it will work fine.

    GsT

  3. #3
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    Wild Nevada
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    Wink Took the muzzle brake for granted

    Well shot the 30 cal PVA brake on my 7 mag . It worked,but was it as good as it could be beings its .051 over size rather than .020-.030 over bore size ? Didn't feel like it was any better than previous smaller brake but was bore.312 instead of .335. So today i shot the rifle with out any brake . Wow ! That rifle kicks hard,no more taking any brake for granted. Now waiting for another 4 port brake that is bored correctly for a 7mm bore.

  4. #4
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    washington.........STATE that is.
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    Quote Originally Posted by worker View Post
    well shot the 30 cal pva brake on my 7 mag . It worked,but was it as good as it could be beings its .051 over size rather than .020-.030 over bore size ? Didn't feel like it was any better than previous smaller brake but was bore.312 instead of .335. So today i shot the rifle with out any brake . Wow ! That rifle kicks hard,no more taking any brake for granted. Now waiting for another 4 port brake that is bored correctly for a 7mm bore.
    lol!!

  5. #5
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    Feb 2003
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    Tennessee
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    The most efficient brake is fitted to a true running barrel then is drilled/bored out to about 0.030"/ side over bullet diameter.

    Opening up the brake bore too much reduces the efficiency.

    Opening up the brake bore where the brake bore is not perfectly concentric to the barrel bore can have a negative effect on accuracy.






    .

  6. #6
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    Dec 2017
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    .020/per side

  7. #7
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    Question .051

    PVA Brake measures .335 and its for a .284 bore . Isn't that too big ?

  8. #8
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    Dec 2003
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    washington.........STATE that is.
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    Quote Originally Posted by Worker View Post
    PVA Brake measures .335 and its for a .284 bore . Isn't that too big ?
    Sure... change it out. You've been told it'll work fine but you're never gonna' be happy until you get it "right"...... so change it out

  9. #9
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    That's what I'm doing

    Watching you tube videos of rifles being shot while being mounted on a sled. Muzzle Brakes and more ( That's they're name) brakes were as good at Terminator brakes at considerably less price. So ordered they'er 4 port self timing.

  10. #10
    Join Date
    Nov 2010
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    290
    Quote Originally Posted by retired View Post
    .020/per side
    I usually go 0.020 over bullet diameter. The Harrel clan also recommend the same tolerance. I guess a little bigger doesn't hurt.

  11. #11
    Join Date
    Jan 2015
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    Quote Originally Posted by Worker View Post
    Watching you tube videos of rifles being shot while being mounted on a sled. Muzzle Brakes and more ( That's they're name) brakes were as good at Terminator brakes at considerably less price. So ordered they'er 4 port self timing.
    Break/brake. Their/they’re....


    But on a more serious note, I’m willing to bet one wouldn’t feel the difference between a .311” and a .335” brake bore on a .284 rifle in a blind taste test.

  12. #12
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    Jan 2015
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    Quote Originally Posted by martin zuck View Post
    I usually go 0.020 over bullet diameter. The Harrel clan also recommend the same tolerance. I guess a little bigger doesn't hurt.
    That’s what I use if I’m making one. That said, I know plenty of people that only buy 30 cal brakes so there’s no chance of them putting a 6mm brake on a 30 cal rifle.

  13. #13
    Join Date
    Oct 2007
    Location
    Connecticut
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    507
    If you have a chance check out Roy Bertolatto (sp?) And his posts on muzzle brake design and testing. He seemed to be pretty thorough and reported his conclusions on his website .

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