Went to LGS today they had 22lr CCI Velocitors. Having been where I bought the gun,he knew of problems. He told me if these CCI's did not work nothing would. Well I put 3 mags through it non stop. So I loaded a mag with mini mags not a problem. Mixed next mag with Feds, mini mags and yes thunder bolts. Not a problrm maybe it is going to be OK. Jerry