I use the Wilson too and have never seen that. But, I never go back and recheck either. I doubt you had enough temp difference to do that.flowrie wrote: ↑Thu Jan 20, 2022 8:43 amI kinda doubt it was the measuring device. I say this because the Wilson trimmer was still setup for 1.910 and when I trimmed again a small amount of material was removed from the casings. Could it be temperature change? Could the chamfer and de-burr after the initial trimming somehow caused a burr on the case mouths? Could the brass spring back a little in length over time (a couple of days)?
https://van.physics.illinois.edu/qa/lis ... mperatures