I have noticed that the fowling in the primer area does seem bad at times shooting the Black Diamond. There are a few things you can do when shooting the rifle. After about 10 - 15 rounds, remove the back lock nut, pull the striker and wipe that area out. Another thing you can do is take some Q-tips with you to the range and as you shoot, dunk that Q-tip with some of the fluid you use to swab and wipe out the breech and nipple also from time to time (not needed every shot mine you). The rifle will seem to shoot much better you will find.