I keep a follow-up reload between my index and middle fingers, tucked in tight at the joint. They stay there surprisingly well until needed to refill the tube. Works nicely for pistola's as much as my Handi Rifle's.
Another thing some of us have found to be useful is to cut the elastic buttstock cartridge carriers in half, sew up the loose sides to keep from fraying, then slide the 1/2 carrier over the wrist. Hold 3 or 4 rounds at the ready.
