Now your just trying t **** me off. We r talking about a female going for a walk, jog or hike most likely on established trails or bike paths ect.
I've run off at least 10 brown bear and close to that # of black bear just with 9×19 , 40 S+W and 357 mag. Never even had to touch hair with my bullet. My wife did it once with her 357 with a brown bear. Never had to fire a shot. And I've been living and working in bear country for 36 years.
Buck shot is as useless on a bear as bird shot is.
Most girls don't want to advertise that they are packin heat.
I've run off dozens of bears with the 41,44 , 45 Colt, 454 Casull + 480 Ruger. Only had to kill 2 of them. Shotguns, generally suck at killing real bears. Lack of penetration.
If she don't have it with her, the greatest bear gun on earth is useless. Hence the? that the op posed and most of our answers
And besides, the? Was pointed at wolves. . Ya don't need a 45/70 to kill a 100 lb wolf. An M4 wise AR 15 loaded with 50-70 gr TSX would far preferable.