Here in the western mountains we consider Black bears a nuisance,killing fawns,moose and elk calves in the Spring like they do. A 45/70 is not a great choice because it won't reach across a draw etc (we don't hunt over bait here) I have a 45/70 as a saddle rifle and am quite familiar with it. These bears are easy to dispatch unlike our Grizzlies. I have no experience in Eastern Canada though.