So I don't own a Henry lever in 45-70 but I did take a few shots from a gun club buddy's and NO thanks. That Henry kicked like a hard mule with full house 45-70 "lever ammo". Now maybe if the ammo was more to the mild "Trapdoor Safe" cast load it would have been more pleasant to shoot. I do own a Pedersoli 1874 Sharps which I have done a lot of true black powder load development and my Sharps is an absolute hoot to shoot ! Accuracy for me is work in progress as hand loading black powder is a challenging task as opposed to traditional smokeless supersonic loads. Here's my Sharps fitted with a Malcom Hi Lux Winchester 5x scope that I shoot at 600 yds :
