RE: 12 ga. vs 30.06 recoil ??
I hunt in both a rifle and a shotgun area so I sight both guns in at the same time each year. Hands down the shotgun isway meaner than my 30-06. The only upside to the recoil of the 12 ga is it made my new 300WM feel very tame. I don't have any calculations, only shooting them back to back as a comparison.