For that rifle, I assume about the same allowable pressure as a smokeless '86 Winchester or Marlin 1895. I'd use 350gr. Hornady round noses and forget about the fancy bullets. They aren't needed at those velocities.
; The 350gr. Hornady, a very accurate bullet, will expand some on deer, and will work wonderfully on moose and elk and bears.
: If that is too light, the 405gr. Remington bullet is a splendid big game bullet up to about 1,800 or 1,900fps, which is the range that single shot should be operating at full strength.
: If deer and black bears are the quarry only, any of the 300gr. bullets would be just great. You should be able to buy Remington 300gr. and 405gr. for around $20.00 or less per box (100) since you live in the States. They're only $24.00 a box up here in the bush. They are the best deal going for a .45/70.
: The Barnes bullets would work just fine. You can find data in the Barnes loading manual, something everyone shooting their bullets should have and READ to avoid pressure problems. You cannot simply seat a Barnes "X" into the case and shoot it. It must be seated the correct distance off the lands or there may be excessive pressure developed.