Okay, I can be slower than the average bear, so forgive me in advance for what may prove to be a dumb question, but here goes. Given that these three cartridges are all straight wall, and share the same diameter, then I should be able to feed .454 Casull and .45 LC through a 45-70 barrel, correct? Am I missing something? If we've already had this conversation, I'm sorry.
You may of course ask why would I want to do such a thing, and I frankly can't answer that one, other than I'm cheap, and if I can get 3 for the price of one, I'll do it.