Definitely a lot for a deer to take, and if you are using lead core bullets, that's typical. Try changing to solid copper- namely maker 300gr or peregrine 310gr bushmaster. You will be far happier with the results on most everything. Moose, bison, eland- may want to go with cast, but I myself will stick the peregrine for everything. Never cared much about 45-70 until I got a Ruger made Marlin 1895 SBL and fell in love with it. I'll take it out over the 7RM unless I'm expecting lot shots. Wasn't happy with initial results with Hornady and speer factory ammo, moved to the solid copper and never looked back.