With the mixture of carbon,and the lube film on 22lr bullets makes a gummy substance.Then your #12 birdshot stick to it like fly paper.These type shells were orginally designed for revolvers and really not meant to use in guns such as yours. Not saying you can,t but why? They don,t shoot any distance anyway. As far as im concerned they are a waste of time and money. Your choice. So, thats what causes your problem. vangunsmith