No reason to ask a gunsmith this question. You can't do anything your asking about. What you can do is have a muzzle brake installed. different muzzle brakes rid ice various amounts of recoil. the howitzer type takes care of most the recoil.
A call to a gunsmith would be more appropriate. If (and if you have the money) a heavier recoil spring is available you could swap it out. BUT, I am not sure what strength the spring is that is already in there. I know when I inherited my Father in Laws.270 it was already modified. (And STILL kicks like a mule)
Coyote Hunter has it right, a buffer is not going to do anything for recoil on that rifle. Having a muzzle brake installed can greatly reduce recoil, but it will make the rifle MUCH louder to shoot ; wear your ear protection ( or lose your hearing)