sorry about the caps. didn't mean to offend anyone.
i i feel that the 45/70 is ahead, because of the many over the counter loads.
the 450 has only one load or that is all i have found.
i think i will go with the 45/70
i have a sb2/synthetic stock, 280 rem, that i have not shot yet
have found a 450 marlin and a 500 s&w barrel, but not a 45/70