I just got around to loading up a rifle Purchased a long while back from White Rabbit. Rifle is set up with a mag spark system for 209 primers. loaded with 60volum Blackhorn 209 powder, a patched .445 RB. Shot at fifty yds., first shot 3" high, wind dead on. Second shot in same hole as first. Had to realy look as I thought I missed the target. On looking on backside of target board it was visible that the second ball had made the hole bigger. Third ball, a distinct hang fire. With each subsequent loading the duration of the hang fire got longer. Same powder,Fed 209 primer, ball and patch. Any suggestion as to where to look?