Originally Posted by
Eric D.
Skimmed the thread and not sure if anyone mentioned it but variation in your measured OAL after trimming will include variation from the sizing process as well because the WFT or similar indexes off the case shoulder. In my experience brass of different lots/headstamps/fire counts/etc will all size back a little differently, as much as 0.003” from what I’ve seen, even from the same die at the same setting. If you’re not aware of sizing variation you may have you’re chasing your tail trying to tighten up trim length variation.