I cast my own mini balls from a Lee mold for my Traditions .50 cal inline. At times the first shot with a clean barrel flies 3-4 in. high at 100 yards (not always though) but the groups seem to tighten with the 2nd and third shot....????? May be the gunner not the gun but this has been consistant since I have owned the gun. I use Pyrodex so perhaps the residue in the barrel tightens up the load.