gnu, just for you I was looking through the Single Action Shooting Society's rules. This is the group that does "cowboy action shooting" and I know that you're interested in doing that. But you got a problem, which I've emphasized here:

Ammunition required for reloads during the course of any stage must be carried on the shooter's person in a bandoleer, cartridge/shotshell belt loop, pouch, holster, or pocket or be safely staged as required by stage instructions. Leather belt slide ammo loops are acceptable; however, shotgun shell slides may not be worn over shotgun loops on an ammo belt. Shotgun loops must be in a single row. Rifle and revolver ammunition may not be carried in a shotshell loop. No ammunition may be carried in the mouth, ears, nose, cleavage, or any other bodily orifice.

It's just so...so...not cowboy to see someone reloading from a bodily orifice, I guess. I mean, what would Roy or Gene or Hopalong or Tom say?