I used Black Hills Ammunition, .45-70, 405gr FPL. So, I would think any modern bullet would meet or exceed the performance of that round. I agree with, "Use what works in the rifle and what you're comfortable with."
I have a box of 220 Partitions looking for work.
"Generally" the folks I know that have done it "brained" them. If that's the plan, either of the 2 you mentioned will work.
I've used the Accubond, and been happy with them.
If his is accurate with the 215 Hybrids, I wouldn't change it up right before a big hunt.
Buffalo are thick-skinned and should have no problem making that 215's jacket open up. Make sure the tips aren't clogged before the hunt. I do that with every brand of HP hunting bullet I use.
I hadn't heard that before.