I went out and shot the smoothbore Bobby Christian built me some more today. I have been trying to find a good rd ball load for 50 yds. Today the wind was blowing about 25 MPH from behind and to the left. After firing a bunch of rds with different loads today i finally found a load that seems to work good. 70 gr Goex 3f, half a lubed fiber cushion wad, a thin overshot card, and a leather patched .575 rd ball. The pic below is of the last 3 shot group i fired using that load. The 2 shots touching the bull are 1" center to center but the 1 high shot spread the group to 1 3/4" center to center. Not bad for no rifling, although i do have a rear sight on it.