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Muzzle break question?

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Old 05-05-2003, 09:56 AM
Bronze Member
Join Date: Jan 2003
Location: santa barbara
Posts: 41
Muzzle break question?

I have a sako 75 26" barrel 300 Weatherby
I shoot 190 SMK @ 3060 FPS

If I put a Muzzle Break on it will
it affect the speed???

Mag-na-port muzzle breaks - what do you guys
think. Any other suggestions welcome

going to the range on wed - will list all specs on the load

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Old 05-05-2003, 01:39 PM
Gold Member
Join Date: Jan 2003
Location: centre,alabama
Posts: 948
Re: Muzzle break question?

montana muzzle brakes will give a 100 fps increase. I loaded identical loads in my 338/300 and one belonging to a friend(his had the Montana brake) and fired the different rifles over a chronograph the one with the Monmtana brake shoot 100 fps+ faster and this was out of a shorter barrel, hell I wouldn't have believed it If
we hadn't done the test!!!
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Old 05-05-2003, 03:37 PM
Platinum Member
Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: Muzzle break question?

I was checking a factory load over the Oehler 35P last fall in my 300wm and a buddy had his there too. Mine was a 700, his a Ruger 77 mk11. Both had 24" bbls and his shot 125 fps faster on average with the same factory box of ammo. This has been my experience with Rugers though, they seem to get a little better speed than the others for some reason... all else being the same. His wasn't a Ruger was it?

Theoretically, there is potential for some extra velocity, as some pressure is still behind the bullet even though the bore is larger in the brake and alot of pressure is vented off as it passes by the vents. The rifling is not slowing down the bullet any longer but, how much this ofsets the larger bore and progressive venting is anyones guess. A 100 fps gain in two or three inches of bbl is possible, but still a guess unless you remove it and then compare to yours. Did you remove it, and were they then both the same? Interesting.
Brent Moffitt
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Old 05-05-2003, 04:21 PM
Platinum Member
Join Date: May 2001
Location: Pennsylvania
Posts: 1,757
Re: Muzzle break question?


That would be the best way to test this theory. Shoot it with the brake and then shoot it without. THE SAME RIFLE. I have done this and there was NO difference in velocity.

As mentioned, the bullet is not touching any steel as it passes through the break. Most brakes need .016" to .022" clearance around the bullet to work well.
Even though the brake may be 2 or 3" longer it is NOT the barrel with rifling in it.

We know that every barrel is different and as the cutter bores the barrel at the factory it wears and there is a slight difference in land depth as this happens. If someone gets a barrel when the cutter is about to be changed, the rifling will not be cut quite as deep as a new cutter will allow.
This is extreme but just a .0001" or .0002" could make a heck of a differance if it happened.

Just a thought.

My experiance is, there is no increase in velocity with a break on.

DC [img]images/icons/smile.gif[/img]
Darryl Cassel
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Old 05-05-2003, 05:31 PM
Platinum Member
Join Date: Jun 2001
Location: Palmer, Alaska
Posts: 2,539
Re: Muzzle break question?

I agree completely. One thing I noticed with both my Ruger .338wm's, was with 250gr Barnes X bullets, I never had any problem reaching the lands.

I have had with all the Remingtons, including the 300wm.

The lack of freebore to reduce pressure in the 700's may be why they yeild a little less velocity than all the various Rugers I've had experience with.

I wonder what type chrono was used as well.

The brake on-off test will tell the tale, gun to gun doesn't at all, but is still interesting to see the difference between the rifles. [img]images/icons/smile.gif[/img]
Brent Moffitt
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Old 05-05-2003, 08:07 PM
Silver Member
Join Date: Dec 2002
Posts: 374
Re: Muzzle break question?

There may be a velocity gain but I'd bet the farm it's not 100fps or anywhere near. My gun w/wo brake makes no noticible difference in speed. I made a VERY tight brake for a 308 cal that was .315 ID and if it did help the velocity it make up for all that speed in accuracy. Shot terrible. I was told as Darryl says that .015 or so is the best number so I made a brake and tried it closer, .015 and opened up. I would say that .015 or more per side is fine.

Another side note. The effectiveness of a muzzle brake is inversly proportional to the bullet weight to powder charge weight. In other words, a 220 swift is the king of recoil reduction and an efficient round, like a 7 BR or a 300 savage will benifit far less. A WSM lets say, will benifit, but not as much as your 300 weatherby.
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!
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Old 05-05-2003, 11:19 PM
Silver Member
Join Date: Sep 2002
Location: Colorado
Posts: 273
Re: Muzzle break question?

Others may know more about this, but having talked to Kevin Knight at muzzlebrake.com , he indicates that his muzzlebrake can actually increase velocity. It is an extension to the barrel, trued and crowned.
I also think it is one of the better looking brakes as it is matched with the barrel. I really like the one he put on my gun. It is worth giving him a call.

I think others on this site either provide or have used others brakes, so hopefully not stepping on any toes.

In a world with lots of options, I have not heard of anyone using Magnaport in some time. I do not really like the looks of the large brake at the end of the barrel.
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