450 No - haven't been to that web site.
; The reason for the wads in my bro's load, is he felt 100gr. of 2F Black powder was all the recoil he wanted with the 500gr. RN bullets he used. The extra space had to be taken up with a filler of some sort, so he just used card wads to get a compressed load. With tang sight and pin-head front, he cut many 1", 3 shot groups at 100 yards. His Shilo rifle was from an early barreled action, with only .0015" deep rifling. It did not want to shoot lead bullets at all for the first 8 years of working with it. We finally go it to shoot lead, but that's a different story or trial and error, then finally success.
: Jacketed and smokeless or jacketed and BP- great. Lead was trouble to to the 1-1/2 thou of rilfing. That barrel should never have left Montana. He still has it although I don't know why.