Muzzle brake question ...

Discussion in 'Rifle Country' started by Legionnaire, Nov 19, 2021.

  1. Legionnaire
    • Contributing Member

    Legionnaire Member

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    I've seen references to a study that demonstrated that using a .30 caliber brake on a 6.5 barrel is only a couple percent less effective than using a 6.5 mm brake. I think I've read a thread or two on the subject as well--not sure if here or somewhere else. Unfortunately, my Google-fu is weak right now and I can't find it. Can anybody point me to the study or a good discussion of the question? Thanks.

    ETA: Another try turned this up:

    https://precisionrifleblog.com/2015/07/07/muzzle-brakes-recoil-results-for-6mm-6-5mm/

    It's pretty good. If you have another/more recent source, I'd welcome it.
     
    Last edited: Nov 19, 2021
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  2. Zerodefect

    Zerodefect Member

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    Never even seen one. I've had 556 and 762 brakes only.
     
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  3. taliv

    taliv Moderator Staff Member

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    There’s not a huge difference in performance from hole size. Just like 9mm still sounds good from a 45acp suppressor.

    what will make a difference in performance is bullet weight vs powder weight. Brakes are more effective on Small bullet with lots of gas as compared to a large bullet with less gas.

    Eg braking a 220 swift makes sense. Braking a 265g subsonic 300blk is a total waste of money
     
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  4. Riomouse911

    Riomouse911 Member

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    Makes sense… I’ve heard handgun shooters say the same thing, more gas to divert = a more pronounced effect on muzzle rise, etc.

    Stay safe.
     
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  5. Legionnaire
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    Legionnaire Member

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    That's what I'm interested in. After buying a new Hellfire in 6mm, I started wondering if another 6.5 or even a .30 cal would have made that much difference. I'm guessing that the larger holes would be more forgiving with regard to carbon buildup. Gotta keep 'em clean, I know, but a little more clearance without sacrificing too much efficiency might be worth it.
     
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  6. dcloco

    dcloco Member

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    Somewhat similar science in using a 30 cal mufflers on smaller diameter projectiles.

    In the 30 cal scenario, most 30 cal mufflers are LONGER than smaller caliber rated mufflers as well.
     
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  7. Varminterror

    Varminterror Member

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    A bunch of guys are just figuring this out in PRS world. So many of us started on big bullets and big cases, then kept the same big brakes as we shrank to BR based 6mm’s... but guys are realizing that little cases don’t have enough power remaining to “fill” a big brake - so a Big Bastard Brake does very little different than a Lil Bastard on a 6BRA, so why spend extra? The advantage of a degree and career based in principles of fluid dynamics, I’ve been happy with smaller brakes on small cases for a long time.

    First port volume especially, but brake port volume is way more critical than bore clearance in a brake.
     
  8. rayatphonix

    rayatphonix Member

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    I’ve got the “Jetblast” muzzle brake in 30 and 6.5 calibers. On a Creedmoor I don’t think I can feel a difference, although I’ve never really thought about it. The effect of the brake is so noticeable, I’m not sure you can tell a difference between the 6.5 and 30 caliber openings.

    If I was to test both on a 308 however, I think the difference would be considerable . Additional ones I’ve bought have all been 30’s simply for the flexibility.
     
  9. Legionnaire
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    Legionnaire Member

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    :rofl:
     
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  10. Bcwitt

    Bcwitt Member

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    The brake on my LAR big bore (50BMG) pushes the entire 30 lb. rifle FOREWARD. Bipod leaves skid marks to prove it.
     
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  11. Armorer 101

    Armorer 101 Member

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    What means a brake is working, a gun moving up, moving down, moving back or moving forward, answer none of the above. The gun should not move at all if a break works perfectly and few do.
     
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  12. CoalCrackerAl

    CoalCrackerAl Member

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    The muzzle brakes that have a sound forward sleeve. How effective are they? Im thinking about one for my Howa 7.62x39. I want to be that guy with an annoying bird cage on the range.
     
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