I would recommend some muscle. Not in the ammo, some standard 150 should do fine so getting that scope on. Then check out (maybe adjust a little for) your preffered higher powered hunt ammo.

The muscle? Put some of your shoulders. Overhead french curls and overhead presses will do wonders. Muscle tissue is MUCH MORE dense than, um, ahhhh, fat. Or worse yet, is no fat at all, bone. Ouch!

I don' t think I' ve shot more than 25-30 rounds at one time thru my old sporterized German Mauser at one range session. I don' t recall it ever being " painful" , even with the old steel butt. But then again I shoot ALOT of shotgun, lots of slugs even year-round.

Better work out this " issue" before there' s a deer in your sight.

Good luck.

Uncle Matt (in IL)