If its just one revolver or a pair of the same calibre, I can shoot a half day at a steady rate from the stuffings of a medium sized "Hippy-purse" made into a shooting bag.
Small flattened horn filled with a 1/4 lb of FFFg. I can add a measuring spout., or;
A measure made from a cartridge case. (.38 Spl = 22 gr.; cut down .30-30 cases for 30 gr.)
capper & a tin or two of spare caps.
pouch of balls. Or EPP UGGs in a snuff box.
lube in a "glue-stick" tube, usually bore-butter.
screw driver.
NIPPLE WRENCH.
a few patches & a small bottle of moosemilk.
couple of paper towels for hand wiping.
Alternatively, I can make cigarette paper cartridges, wrapped in Aluminum foil in 5s, carried in a cap pouch. The other stuff, less the ball pouch, horn, & measure, can go in a belt pouch.
PS; I forgot; You need a nipple wrench as well!