I have fitted several Holland QD brakes to my customers 300 WSM rifles and they have always been happy with the results.
On your heavier rifle the resutls will not be as dramatica as they would be on a light rifle but the recoil will certainly be cut by a noticable amount.
I use only Holland QDs as they are the best all around hunting and shooting brake I have tested yet as well as being a good looking brake.
GOod Shooting!!!
Kirby Allen(50)