; I wasn't considering wimpy little trap loads (that kids can shoot) as a 12 bore load.
: My 12 bore loads for 2 3/4", 1.5oz. goose loads run 41 lb. recoil on the calculator. That is considerably higher than the .308's pidley 18lbs. by more than double and higher than any .300 mag. except one of the ridiculous .300(or larger) Utra mags.
: A .308 with handloads is about identical to a .30/06 with factory ammo - around 20lb. recoil- managable for most men. I am thinking of a 180gr. at 2,700fps. With a VVN powder, this is easily obtainable. It is suitable for most North American game with proper hits. A .303 runs 2,550fps with the same weight bullet, and is suitable for the same range of game, but is generally available in less accurate rifles, normally older military guns.
: The game animal, inside 200yds. would likely not know the difference, both shot through the lungs.