Hate to be the wuss here, but you might want to shoot someone elses 45-70 carbine first...I had a super 16 with rynite stock and a 2.5 scope on it and it kicked horribly! Now I shoot a 14 inch 444 marlin without a break, but the stock and weight of the 45-70 carbine just hurt too much. Rather shoot my 338 mag all day long than that bad bear.
regards,
graycg