I've helped my buddy shoot several bricks of recent vintage Thunderbolts through his 15-22 with great results. Feeding problems lead back to magazine loading. Accuracy is very good and no leading problems. No duds or squibs that I know of. These results were in shooting sessions of 100-200 rds,deliberate aimed fire from a clean and well maintained rifle. I would imagine 1000-2000 rd sessions could get different results.