New muzzle brake from Jlbillet.com question

[Mbiker_101]

Just purchased a new muzzle brake from jlbillet.com a great local shop here in San Diego and the're getting great recoil reduction reviews. Vet owned and operated as well.

But here's my question.

1. Does the slanted front cause bullet destabilization for long range? 500+ yards
2. Do the slanted side cuts cause destabilization?

http://www.jlbillet.com/308-cal-v-p-r-muzzle-brake/#PhotoSwipe1438443478073

[FourT6and2]

Check out the series on Muzzle Brakes: www.precisionrifleblog.com

[Mbiker_101]

Great read fourT6, i found that posted in another thread and thats what made me think about the design, every brake in that test had a flat face. The surefire that was way off the the left had a larger hole on the right. The gasses push the bullet/barrel left.

If a small hole caused that much poi shift the what would the angled cuts cause?

[Shakey]

I'm no expert, but the face of that brake looks like a hot mess - angled, curved, with a big notch cut into it.

Heck, you own it. Why don't you tell us how it shoots?

[Mbiker_101]

Well i thought about that shakey but if i don't shoot it i can return it. Thought i'd get the input from the precision shooters and then decide to keep or return.

[JMP]

While the brake is going to affect the POI, the stability of your projectile downrange is a separate process. Stability is dictated based on the rotational inertia and velocity of your bullet.

There are two things that a brake is generally trying to accomplish.
1. Reduce the upward thrust so your POA doesn't change that much in order to spot your hits.
2. Reduce the recoil you feel.

Both of these are accomplished by diverting gasses with an opposing force. The efficiency of the brake is dependent on the surface area of the ports and the directionality of the ports.

The larger the surface area is, generally, the larger volume of gas that is going to be diverted. Thus, you are going to get the most reduction with more surface area expose (i.e. more and larger ports).

The directionality of the ports is going to influence how you want the brake to perform. To reduce upward thrust to spot your hit, you will want a solid base that pushes the muzzle down. As this is the primary purpose of muzzle brakes, most brakes do this well.

In order to reduce the recoil, you will get the most reduction with a brake with ports that divert the gas backwards at the steepest angle. The clamshell shaped ports generally do this the best. You will want this on the boomstick type guns that start feeling uncomfortable. The problem with this is that the shockwave angles backwards more rather than horizontally. This creates the "obnoxious" brakes rather than the more passive brakes.

For the clamshell style brakes that do a really good job at diverting gases backwards and reducing recoil, I want to have them on larger rifles with long barrels. If the brake is too efficient with the directionality for recoil reduction, it can become a nuisance to yourself as a shooter.

The brake you posted seems to appear to have a moderate design for recoil management. It isn't passive, but it isn't that steep either. It looks like it is designed for an AR-10. However, it is sufficiently curved where I'd want at least a 20" barrel. For a 16" barrel you want a passive brake.

This is why suppressors are really more optimal on shorter barrels. Once your barrel becomes sufficiently long (30"+) it's time to bring in the most efficient brake and shoot a full clamshell. It will not make you popular at the range, but it will reduce the recoil.

Personally, I'd go for a passive brake on a 308 with flat ports as you are mostly concerned with muzzle climb/upward thrust on a short action as they don't kick that hard. Then, I'd go for long barrels and steep clamshells on large magnum rifles.

[ar15barrels]

1. Does the slanted front cause bullet destabilization for long range? 500+ yards
2. Do the slanted side cuts cause destabilization?

http://www.jlbillet.com/308-cal-v-p-...e1438443478073

The slanted faces certainly do not HELP.
It remains to be seen if they HURT though.
Zero the gun with a similar weight flat faced brake and shoot some groups.
Then install the slant brake and shoot some groups.
Make note of the change after the slant brake is added.

[vliberatore]

Check out the series on Muzzle Brakes: www.precisionrifleblog.com

Screw the brakes, did you see those bullets??

[Devilmonkey89]

I have one on my LR308, i should probably take it off and shoot groups and throw it back on and check for shifts.

[LBDamned]

I'm no expert, but the face of that brake looks like a hot mess - angled, curved, with a big notch cut into it.

Heck, you own it. Why don't you tell us how it shoots?

I have a Diamondhead T-Brake: http://www.diamondhead-usa.com/produ...ensator-5-56mm ... and while the side ports aren't curved, the front is angled (the opposite direction) - and it works incredibly well (better than Spikes Dynacomp, Griffin M4SD comp and M4SD Flash Comp)... but Manticore Nightbrake seems to be as good as those too...

As for JLBillet - I haven't used their muzzle devices, but got their 308 hand-guard (thanks to SaltWorks recommendation) and the thing is awesome! Lightest 308 I've found and excellent quality!

So based on similar design of what I've used... and quality of other JLB products, I'd take a chance on their brake (if I needed one).

^^^ AR-15 and LR-308 build

[Mbiker_101]

Devilmonkey, have you shot the jl brake?

Lbdamned, glad to hear the diamondhead works ok, it looks very silimar but opposite slant.

[Devilmonkey89]

Devilmonkey, have you shot the jl brake?

Lbdamned, glad to hear the diamondhead works ok, it looks very silimar but opposite slant.

Yes i have, but off a grip pod and before i had an adjustable GB. I was shooting my steel plate at 132 yards in ocatillo BLM.

[CRTguns]

Jimi of J billet does not make crap. He's a pretty sharp dude. Its worth a try. worst case, it will work like every other brake out there. Best case, you'll experience the "magic feather syndrome" with your new brake and become a better shooter and competitor.

[LynnJr]

Your barrel whips up and down when fired and that causes the muzzle to rise.

The weight of the muzzlebrake acts like a tuner on the end of the barrel.

When you add a heavier brake you will get more rise because it drooped more before firing and the extra mass means it rose further as well.

Muzzlebrake have become pure snake oil.

Recoil reduction is surface area size for impingement and direction.

Looks sells more muzzlebrakes than recoil reduction ever has.

In that testing notice that the muzzlebrake without any holes at all on its upper surface reduced muzzle lift the best.

[CMBrowning]

Looks sells more muzzlebrakes than recoil reduction ever has.

Indeed.