I can't answer that because it's too complicated.
My 760 30-06 is fine, even though they have a rep. as kicking.
A 660 308 in a Brown Pounder with a Decelerator is fine for a decent amount
of shooting. But gets uncomfortable.
A light 300 mag with a Decelerator is fine for literally 3 shots.
After the second, they get increasingly less pleasant. 5 or 6 is unpleasant.
I can grit my teeth, concentrate, and do ok. But it ain't fun.
Ex-B-I-L had a Ruger 77 in 7mag.
I would rather shoot my 300 2 shots to one in that POS!