Further note - the new "Handloader" magazine has an article on loading BP (and smokeless) slug and shot loads in shotshells of brass, plastic and paper for normal 2 3/4" and 3" guns, along with the use of the necesary oversized wads along with the results. Powders used were Unique, Blue Dot and SR4756, which would be my choice. Herco can be substituted for Unique, but is a mite slower burning - by about 2 gr. is all.

He didn't use round balls, but did use the Lyman 525gr. slug (pure lead) and some other slugs as well that had attached wad columns. I've a bunch of Lyman slugs for testing which weigh 506gr. in WW alloy, given to me by a friend in Alberta. Inside red WW wads, they shoot well and can easily be driven to 1,500fps with smokeless.

Interstingly enough, the BP loads with oversized wads in brass cases developed 4 and 4 1/2 dram velocities, when only using 3 drams - GOEX.

Curl - your ammo looks like factory - well done. I can see I'll have to get busy and make a roll crimper for my stuff. I expect the crimper, driven by a drill press, will also make a nice crimp tool for RB loads and brass cases. The cases will need lube around the outside edge, of course, to prevent galling.