Hmmm. Well that makes me feel better . I'm not exactly a big guy but I have no problems shooting a hundred or more rounds from my 7.62 AK, 20 rounds or so from my Mosin Nagant 91/30, etc.
Cool well maybe I will get the Mossberg 12 ga combo then, that looks great!
Yea, you should only be using 7/8 or 1oz 8 shot for clays anyway. It definitely gets easier. The first time I shouldered a 12ga, it seemed like a lot, but now I can shoot clays all day. It will be nothing compared to a mosin nagant. Especially a mosin with a metal backplate when you have the rubber on the 12ga.
Also, just from how you described the barrel differences in the combo packs you're looking at, are you talking about the combos that maybe have a 28" and a 24"? Be careful you don't pick up a combo with a 28 smooth bore with a rifled 24" that is designed for hunting with slugs.