dixie gun works have such brass too

KA1202 Brass Rimfire Case - .32RF (.310 Round Ball) $5.00

Machined from brass rod stock and designed to use a .22 rimfire short in a special chamber inside the cartridge. The firing pin hits the .22’s rimfire and ignites the black powder loaded in the main cartridge. Fill this case as full as possible with black powder leaving room for a round ball. Load these cases one at a time in repeating arms; the .22’s primer will not always be at the firing pin’s point of impact. All chambers can be loaded in the Richards and Richards Mason Colt conversions. The Spencer rimfire case work nicely in both rifle and carbine chambered for .56/50 and .56/52. The .22 rimfire blanks (our stock number XA2710 work well with this.) These cases cannot be used in the 1866 Winchester and the Henry because the guns have two firing pin lugs. Sold $5.00 each or 6/$25.50. Please specify quantity in comment section when ordering.

also as extra long rimfire

http://www.dixiegunworks.com/product_info.php?products_id=8154
http://www.dixiegunworks.com/product_info.php?products_id=8155

years ago I have got some DGW cases and load dummy's for the collector box with a 32 short Colt CF die set thats laying around here unemployed. this is the right die set if you wish to work with your reloading press.

simply load a 8mm roundball

32 short RF, 32 extra long RF( in fact with the roundball the right cartridge for a 32 long chamber)
a 320 short CF blank case( euro version of the 32 short CF) and a 320 long CF caSE