I have a bunch of 405 grain bevel base bullets that I am trying to make work in my Marlin 45/70 rifle. Every load I have tried with Trail Boss, Unique and 3031 powder (900-1200 FPS) causes the bullet to tumble, very poor accuracy. With 405 grain gas check bullets, the rifle shoots good (1" at 50 yards, 1.5" at 100 yards), so the rifle will shoot cast lead.

I'm thinking these bullets may shoot OK if the base of the bullet is protected by some sort of wad, maybe cardboard? I tried toilet paper and that was no good, bullets still tumbled. I have around 350 of these bevel base bullets and I'd love to be able to use them for 50 yard target shooting, plinking, maybe medium size game....

Any ideas?