ElkCampMaster - some pretty good advice here on shooting hard recoiling guns. However, just get a Caldwell Lead Sled or a Benchmaster - get the gun sighted in - you will never feel the recoil in the field shooting at big game.

I have a carbine length T/C Black Diamond. Its pet load is a 410 grain Hornady Great Plains bullet ahead of 120 grains of Triple 7 with a Ballistic Bridge sub base in between. I can shoot this all day off the Lead Sled without a problem. Shot it this past Monday at an elk - got the elk - and never felt the recoil. That night, my wife pointed out the bruise on my right shoulder - starting to turn a little green and purple. Up until then, I'd never even noticed it.

And I don't know if its just me or what; but a lot of .300 Mags seem to have a more unpleasant recoil impulse than a .338. More of a sharp impluse. I'm sure the .338 has more foot pounds, though.