JT, in reality, Cheatermk3 is right on the mark, high level 2 to low level 3 loads in the 45-70 are going to do what ever you need. In the BC barrel, I believe with careful load work and the right powder, you could easily be close to 458 win mag velocities with the 300gr partition, not that I'd want to be behind that metal butt plate, though!!! :eek: I'll be finding out before too long, I've ordered a 45-70 BC barrel for my BC since the original barrel is a 45-120 now. I'm also working up a hot load of H4198 and nosler partitions, after I chrono them out of the 22" handi barrel, I'll do the same out of the BC barrel for a comparison of what an extra 10" of barrel does for the velocity.