I shoot 210 grain NP's through my 338 Win. Mag. and the recoil feels like that of an '06 to me. Though, you'll notice a big difference when you shoot the 250 grain bullet, which I also hunt with. When I'm at the range, I'll usually shoot about twenty rounds with the 210 grains and about 15-20 from the 250's before I switch to a different gun for a bit. I put a decelerator pad on my 338 and it helped alot and also changed the crap factory stock and put a McMillan stock on which fitted really well when I shouldered the rifle. With a stock that fits you well and a good decelerator pad, I see no reason why you can't shoot two boxes plus from your 338 during one range session.