Hello.......I just finished building a smoothbore Tulle. 20 ga. .62 cal. While experimenting with loads I discovered that a .610 roundball on top of 65 grains of 3f swiss and two over powder cards followed by an over shot card shoots 1 1/2 inch groups out to about 40 yards!! I would have never thought about trying a roundball without a patch if the darn thing hadn't of got so dang hard to get a patched roundball down after a shot or two....very dirty. Anyway most of my experence has been with rifles and smoothbores are a whole new ball game. Does anyone else shoot a roundball from a smoothbore without a patch??