I purchased a 100 new Remington .22-250 cases to fire-form for my newly re-barreled rifle (.22-250AI). The cases have been fire-formed and shot a few times using the Ackley Improved loads. Case length varies between 1.8760" and 1.9100. Thus, I haven't been able to trim the cases yet. Just wondering if any of guys have had this problem? I don't enjoy trimming cases but it would be nice to have consistent length. I think my Lee case trimmer for .22-250 trims to 1.902" so do you have any idea of about how many firings it takes for the case to lengthen enough to trim? I realize it would probably depend some on the load.