I haven't shot a factory .45-70 or a factory 12 gauge round in I don't know how long. I think I may have forgotten what recoil is with those two lol.
Seriously tho, most of what I shoot in my .45-70's these days feels like it has about as much recoil as a .30-30. I use Trail Boss and Unique under 300, 350, and 405 grain hard cast lead and could shoot any one of those all day long. I love pushing those big bullets slower.