mauser mark and james are correct if the shot is low the rear sight has to be moved up a question from what I remember on your other post you were doing quite well with the powerbelt .The bullets you used to day are they from the same package or a newer lot of powerbelts?I myself never had any good results with the powerbelt would all ways pick up a flyer in the groupe.One more thing your sight picture is it the same or did you change somthing when looking at the sights ? I would stop using the rubbing alcohol a spit patch only then fliped over again and then one dry patch.What I also do before firing the flinter is to dump 10 grains of 4 f down the barrel prime the pan and fire then followed with a spit patch then a dry patch I found that this will burn up any oil left in the barrel. good luck