I have a 10/22 with a Green mountain 20" fluted BBL. My gun will only reliably shoot Federal brand .22lr ammunition, and some varieties of federal better than others. The problem is mostly FTFs. The best luck i have had is the Federal Wal Mart hollowpoint bulkpacks (rarely fail). most other brands are not even worth the trouble of loading the mag. Anybody have similar problems? any ideas on what the problem is? i have a very experienced gunsmith in the family, so i am considering taking it to him, but he is usually very busy, so for now i just shoot what works.