Here is what I have:
A 24-in barrel 45-90 and black powder. For bullets, I currently have some Missouri bullet company Buffalo number one bullets reported to be hardball alloy at 18 bhn that I have re-lubed with modified emmerts. I also have some 457193 bullets that I believe are between 9 and 12 bhn.
I am the type of hunter who doesn't take a shot on an elk that's anything other than broadside or slightly quartering.
Given that information, what would the impact velocity limitations be for these two bullets? Also, what is the bullet weight limitation for this type of shot on an elk? Would the original 300 grain Express bullet work with this type of shot and what would the velocity limitation on that bullet be if it were one of the same two hardnesses that I have listed above for the other bullets?