I have been using 45-70 "Cowboy" rounds in my Trapdoor. They have a muzzle velocity of 1183, vs 1330 for Remington Express rounds. Am I wasting time (internet ordering) and money? Are the Remingtons just as safe? Doesn't seem to be that much difference in velocity, so I assume not much pressure difference either. By the way, I know some will say "BP only", but I do want to stay with smokeless.