100 shots of trap loads is a far cry from a belted magnum rifle in "felt" recoil. I know I shoot both.

100 rds of trap loads in or even the bit stronger sporting clays loads are doable. But one box of 20 7mm Rem mags is, to me, worse.

Weight of my two guns is part of it, the shotgun is heavier than the rifle. Also the shot gun is a auto & rifle a bolt action. These are major differences in recoil.

He'd best try some rifles for himself, it's the only way he's going to KNOW.