Pistoleer is a category that requires two revolvers, a rifle, and a shotgun. Rarely, if ever, do stages call for a third group of five pistol shots. Pistols may start the stage loaded and capped, but if using a single sidearm, then changing out a spare cylinder calls for it to be loaded then capped on the clock.
Steel Horse is right in that if a stage calls for a single reload, all chambers loaded and 5 capped, with the sixth capped on the clock.
One posse, KVC, will create stages that would best be described as slightly deranged. . .shooter instructions call for multiple reloads. But they give advance notice when they send the match confirmation to you, and if you do not have spare cylinders or third pistol, I would have no doubt they would either loan one, or you could expect EVERYONE will be loading and capping the extra rounds on the clock.
But you must remember that these folks would love to create a "Josey Wales" category and see a stage designed around the carrying of four to six revolvers, plus the use of harsh language.
RCJ