a long time ago I met two brothers who got me started on trapdoors.
and when I moved to texas iot got sold.
however I found that rapine makes a very good govt bullet in a 460 that pan lubed, with 65 grs 2fg and a wad with fed 215 primers, in mine shot under one inch at 100 yards. on onme occasion a fdriend who had a 1885 rifle used my ammo and did the same then sol;d the gun.
cheers
irish
also, go look at the burbank muzzle loaders website they have trapdoor matches.