I have a 300 Win-Mag built on the 1917 Enfield action with a synthetic stock.
I love it. The recoil is not that bad. If you can shoot an '06 without flinching, then you can shoot the 300WM also. I actually enjoy shooting it from the bench. I'm 6 feet and weigh 180. (NOT big) so it isn't like I'm 6'4" 250.
At the bench, you can use some padding on your shoulder anyway. AND we all know that when you shoot at a deer or elk, you'll never remember the sound of the shot, let alone the recoil!
The 8 pounds of weight will help tame the recoil, mine weighs 9 pounds 3 oz. with a scope.
Kev