I have tried to work my way through most of the magnums (7 mm Rem, 7 mm Wby, .270 Wby, .300 Win, .300 H&H, .308 Norma, .338 Win Mag, .338-378 KT, .30-378 Wby, .350 Rem Mag, .375 H&H, .458 Win Mag, probably others that I do not remember)
The only one that REALLY hurt me was a Ruger 77 Mark I in .458 Win Mag, with very hot hand-loads pushing about a half-pound lead bullet (OK it was probably only about 500 grains, but you know what I mean...) I shot one round from the hip to see what I thought, then three rounds from the shoulder. It was like going three rounds with George Chuvalo. I am not man enough for that cartridge..........and BTW the fellow who got that rifle scoped it and opened his skull up like a tomato!
I agree with BIGREDD about full power loads in a 12 gauge, they are just plain nasty - especially slugs in rifled barrels.
Doug