Do any of you folks know if a KDF has any effect on accuracy, whether good or bad? I have then on a couple rifles I purchased and I'm starting to wonder if they are a negative influence on accuracy?

I went through the muzzle brake phase a while back; all were KDF. No change in accuracy at all (even in sub MOA rifles) but sometimes a big change in POI. Biggest change is POI was with the bigger kickers, due to the change in recoil impulse.

KDF....?????

Ted, a type of muzzle brake. Some are factory installed and some are aftermarket.

Kleingunther Distinguished Firearms. Seguin, TX

Phil still has KDF in Seguin, Texas. He does the brakes, but also does custom work on Blasers, and has a stock guy as well. I've had him do several projects for me. Good turn-around and fair pricing.

I went through a phase of using the KDF and it worked, and accuracy never changed one bit nor did POI for that matter..I decided I didn't need them on guns up to the 416 Remington, but found the helped on the really big bores, but after awhile, and after ending each shooting session with about 5 or 10 shots off hand with the KDF off, I finally developed and immunity to the recoil and have not used a brake for a number of years now..They did serve a wonderful purpose however and I never had an issue with them at all.

Like many I went through a muzzle break phase. I have shot several different ones.

I can say that the KDF was the most efficient, most effective of ALL the ones I have shot.
A buddy and I took 4 rifles down to KDF and had muzzle breaks installed. We had shot the rifles before. In every case the rifles shot even more accurate with the same loads, after the brakes were installed.

I can say a 300 Weatherby Mag with a KDF kicks less than a 308 without a break.

For my money the KDF is the best.

All breaks are LOUDER, IMHO.

I have found Magna Port to do a good job of reducing recoil and especially muzzle rise.

In the field I do not find it any louder than a regular barrel.

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I can say a 300 Weatherby Mag with a KDF kicks less than a 308 without a break.

Yes, I use one on a 300 Witherbee Blaser R93 and the recoil reduction is just about what you describe; quite effective.

I have NOT noticed a POI shift; the inital shot(s) pluncked 'em right where I previously had it sighted-in at, 3" high @ 100 meters, the same outstanding accuracy.

With the light R93 platform the death-grip on the bags was significantly reduced when load testing and sighting-in.

quote:

I have found Magna Port to do a good job of reducing recoil and especially muzzle rise.

Both the 9.3x62 & .375H&H barrels had this option too - Agree.

I'm looking at a brake, but I'm leaning towards the Holland QD type designs as the designs with holes right around blow up a lot of dust. I'll assume that the KDF does the same?

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Originally posted by strapman:
Ted, a type of muzzle brake. Some are factory installed and some are aftermarket.

Thanks strap

Properly installed a muzzzle brake will have no effect on accuracy. However due to the fact the barrel is recrowned during the process of the install and because of the decrease in recoil, reports of improved accuracy are quite common. I have installed a variety of different brands of muzzle brakes and KDF brakes are as good as any and better than many.

Regarding the change in POI, its not a direct result of the brake but of recoil impulse. If you shoot from a well supported position like the bench you probably won't see it. Its when you shoot standing or from another less supportive position that the reduction in recoil wil make you body react differently than the exact same shot without one, all else being equal.

quote:

Originally posted by tiggertate:
Regarding the change in POI, its not a direct result of the brake but of recoil impulse. If you shoot from a well supported position like the bench you probably won't see it. Its when you shoot standing or from another less supportive position that the reduction in recoil wil make you body react differently than the exact same shot without one, all else being equal.

Normally the brakes does not itselve change poi.
Certainly no brakes changes poi because of the reduced recoil. As the recoilreduction doesn´t take place before the bullet has left the barrel.
The recoilreduction is caused by redirecting the powdergasses(rocketeffect) thereby reducing the secondary recoil.

Some or manny brakes can though changes poi, caused by the added muzzlewheight, that also might change barrelvibrations.
Some asymetric brakes can change poi, because the gas that is released when the bullet leaves the barrel, might create turbulens around the bullet after leaving the barrel, but before it fully has left the brake.
Brakes that is designed to reduce muzzeljump, has a tendence to result in a higher poi, as the gas might bounce on the more closed bottom in the brake, thereby pushing the bullet slightly upwards

All tecnical reasons might be overruled by what goes on between the ears of the shooter

You're right about that; I guess I never thought it all the way through. The bullet is gone by the time recoil begins. My brakes were symetrical so it must have been barrel a tuning issue. I would have thought that might affect accuracy as well. Guess I was lucky that it didn't.