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Case gauges are nice for letting you know there's a pretty good chance your loaded round is going to chamber, but they don't tell the complete story. For bottle neck cartridges, I put my trust in a true headspace gauge like the Hornady Comparator or the RCBS Precision Mic.

In another thread I described how my Lyman gauge was leading me to push the shoulder back 10-12 thousandths beyond SAAMI spec. The ammo functioned fine, and was plenty accurate, but I was getting flattened primers even at minimum charges.

Shoulders getting pushed backwards and shoved forwards +/- ~15 thousandths sure isn't a good thing for brass life either.

Thanks Jeff H. I’ll check on a headspace Guage

Gatsby wrote: ↑October 5th, 2021, 2:48 am Those were both excellent replies.

SMG: thanks for that summary. This winter I was going to experiment with faster powders for my 10-1/2" but this made me re-evaluate. I wouldn't want to trade reliability for a few FPS.

There is nothing inherently wrong with CBC brass; I reload it without any more problems than any other. CBC makes (I believe) Magtech as well. One thing I'd like to add though: if you've never bought any then it's possible it was picked up by accident at the range, and you don't know the history of the brass. It may have been left because it was on the 87th reload.

I believe you may be correct Gatsby

https://www.thearmorylife.com/levar-rev ... on-buster/
One of these might have come in handy a couple of weeks ago?