I have a Marlin 1895 GG in 45-70 and I want to start rolling my own ammo for it. I plan to use the rifle as a close range moose and bear gun. I have a box of Oregon Trail laser cast 405 gr FP BT and new RP brass. I'm curious as to which powder should I start with? H4831? IMR 4198? IMR 3031? Also would I see a significant performance increase with Oregon Trails true shot ammo over the standard laser cast?