Actually never tried to fire it for lack of ammo. That s**t is almost as hard to find as .32 rf extra short for the radial revolver!Cool... do both barrels fire at the same time? How do you site in both barrels so that they hit the same spot no matter what distance you fire from? That's some advanced shooting skills there. For extra credit, I want to see one of the bullets hit the other bullet mid-flight. I would guess one caliber is faster than the other (9mm?), so you'll somehow need to get the slower caliber to fire a fraction of a second earlier than the faster caliber. Anyway, I think I've given you enough for your project next weekend.
I suppose you could fire both barrels at once, though.