Jeff S,
Repeatedly firing one barrel, without a shell/cartridge or snap cap in the other, allows inertia from the repeated recoil to jam the firing pin forward( sometimes even if it has springs). Don't ask how I know this.
Mike
It's really funny that you mentioned shooting just the right barrel. Today, I shot my first round of skeet using this hammer gun. I shot a 17, which isn't bad for my first round with it. I really need to focus on swinging those heavy barrels. I was "behind" the clay a few times. Anyway, I realized that when I shot the "doubles" (stations 1, 2, 6 and 7) I didn't have the problem. As I was driving home I concluded that next time, while shooting singles, I would load both barrels, but only cock one of the hammers (both barrels are choked the same). Eventually I may have learn how to reload these shells. One round of skeet equals $40 for RST shells.
