Nitro,

The brass on the loaded ball cartridges is 25mm (1").

The primed hulls are UEE straight wall plastic made by Cheddite, so internally, all brass heights are all the same - fiocchi hulls too.

New Cheddite paper hulls 12 and sometimes 20 ga. as well as the above plastics are available at http://www.grafs.com/. Ched paper hulls are also internally the same, but I believe there is either different roll crimp pressure, or slightly different wall thickness between the two. Plastic test loads regulated first for me. I took a break to do some hunting, shot a dandy buck, and you know where I am now...

Balistic products also stocks cheddite hulls.

The shot loads on the right are factory Gamebore paper w/ fiber wad. I did not measure them, but 5/8" sounds about right.