As I have written before, I tend to use a lot of very slow military surplus gunpowder with my PP ammo, having found it gives the best results. Typically I'll use something like IMR4227 or Reloader 7 as a kicker to get it lit. But today I wanted to try my .350" 210 grain muzzleloader bullets in my Marlin 336 that was originally a 35 Remington, now a 358 win. The issue is the microgroove barrel's bore is .353" which normally wouldn't work with a bullet that small. So I thought, they bump up fine with black powder, so what would happen if I use that as a kicker? I loaded up some with 1cc 2Fg, plus enough WC857 to give about .100" compression with the bullet seated. Patched the bullets with the 15lb green bar paper, and they came out at .361". They're pure lead so the seating die rearranged the nose a bit but nothing too awful. Shot at 100 yds, they all grouped together at the limits of my vision, about 2 inches. I don't have any idea of the velocity but the recoil was plenty stout and they got there quick. No pressure issues, nice looking primers and easy ejection. Looks like that bullet mould will be able to serve double duty, dip lube for the muzzleloader and paper patch for the cartridge rifle. Great fun!