Normally, I'd suspect me more than the Hornady Comparator, but I am pretty good with calipers, micrometers etc as I've got quite a bit of experience rebuilding engines.
I just have questions about reloading and what happens to brass when you fire a gun. My Lapua brass measured anywhere from 1.529 to 1.531 when it was new. I swear it measured 1.536 to 1.538 after the first time it was fired. My Lee case trim gauge trims the brass to 1.912 so this brass has been shoulder bumped and trimmed to that length twice now.
On edit: I resized the new brass before I loaded it, but I didn't measure it after sizing so I don't know if it went straight from 1.529 to 1.5737 on firing or if it ended up somewhere in the middle after sizing. I used the standard setup with a FL sizing die which should have sized it to SAAMI specs.
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