Have never heard of any serial numbers to avoid. Whether the 2000 rifles that were affected by the recall were not chambered properly or there was another issue I have never understood. However if the issues pointed out were in fact the real problem, why does this cartridge perform today in pre 64 actions and various other firearms. Have gauged several originals and never found one that wasn't headspaced properly. Also, measuring fired brass from an original to brass fired in a custom shows no real differences in chamber dimensions.
