I have three different rifles and all three have muzzle brakes..
!. 300 Win Mag, model 70 Winchester with the most common brake the you
see in the books and magazines with the three large ports on the sides and
it works very well.. I would guesstimate about 50 to 60 % drop in kick.
2. The next two are from the www.wittmachines.com
they are the bolt
on type and I like them the best that I have tried!! They are about 40%
larger than the regular kind but have several advantages over the others..
The reduce the kick by about 70% and you can install it in about 15 to 30
minutes with no problem..
They are a lot cheaper than the others and if you don't like it?? Take it off
and you can always install one of the threaded kind??
Once it is installed on the barrel and leveled up to everything else, Scope,
and etc. etc. Turn it bottom side up and put, LOCTITE THREAD LOCKER,
#271 (RED) in the locking threads and tighten the threads down real good.
I have one of these kind on my 300 Win Mag, bench gun and one on a
338 06 and my Grand daughter, (110 pounds of her) has a good time with it..
I would answer any questions if I can