wildwood,
Without photos we can't give specific information, but in general you have a 9mm rimfire/6mm Flobert combination gun commonly called a garden gun. Most have proofmarks on the smoothbore barrel showing they were proofed for a single projectile (bullet). Bulleted ammo was available at one time, but I have only been able to find shotshells for the 9mm barrel. The 6mm barrel is also proofed for a single projectile but since it is rifled there would be no question it was intended for bulleted ammo. I have seen 6mm rimfire ammo for sale but since it is so close in size to 22 rimfire, that is the ammo most owners use. Most of the 6mm chambers were reamed to a "generous" length and will take longer cartridges, but I mostly use either 22 Short CB caps or normal 22 Shorts, given the purpose of the gun. The rifled barrel is pleasingly accurate at short distance and the smoothbore barrel gives pretty good patterns, but at very short distances. Lacking 9mm Rimfire bulleted ammo I can only speculate about its performance, but the range should be very limited also. While these guns are fun, they are not toys and especially should be used with care, especially if 9mm bulleted ammo is located.
Mike
