If you get the A-bolt the BOSS is not purely evil, but it is real loud. If you want the "tunability" of the BOSS you can get the Conventional Recoil model.

I have a Winchester 70 with a BOSS in a 7mmRemMag. Last time I took it to the range I shot a 5 shot group that I could cover with a nickel, using factory ammo. So, needless to say I like the BOSS system.