Look at pages 3 and 4 of this thread. They describe the assassin muzzle brake. I have them on all my rifles. They do a unbelievable job of cutting down recoil. On page 4 there are examples of the brake working on rifles.
http://www.longrangehunting.com/forums/f19/muzzle-breaks-142277/index4.html
There have been many questions asking what tuning does and what effect it has compared
to non-tuned brakes.
In all of our test, every brake we tested was the same design internally for that style of brake and worked better on one cartridge than another only and degraded in recoil reduction with other cartridges.
Each cartridge is unique and to get the best performance the brake must be designed for that cartridge to achieve maximum performance.
Taking the cartridge, powder, bullet weight, velocity and rifle weight. I can tune the Assassin
and be within less that 1 ft/lb of the actual recoil using all of the methods of calculations.
Keep in mind that "ALL" muzzle brakes work to some extent and it is no wonder that most are happy with 30% to 50% recoil reduction.
With most cartridges/rifles this is more than enough to make a big difference in shoot ability.
Noise is always a big issue with or without a brake and "NO" rifle should be shot without some sort of hearing protection. All test proved there is no such thing as a quite brake or a quite rifle,
You may think you are getting away with firing a rifle once or twice but you are not. We found all rifles to be in the 106 DB to 108 DB range and the tuned reduced it to 105 DB (Not enough to
eliminate hearing protection). If DB levels reach 80 to 85 DB damage will defiantly occur.
Port angles can effect the perceived sound levels (DB) but they don't lessen the actual DB levels.
The Highest level of recoil reduction I have been able to produce with tuning was on a 30x378
that produced over 73% recoil reduction. is 73% necessary ? not with many shooters but it could make the difference of shooting it or not with many others.(This rifle was already braked and tested at 51% reduction, the move to 73+% was major and a big difference to the owner.
Efficiency Is the only way to get the most recoil reduction and the reason for tuning.
I hope this explains the reason for tuning and the benefits it offers. These brakes are CUSTOM one of a kind brakes for the particular rifle.
J E CUSTOM