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I've seen a guy shoot three good targets outdoors, followed by a 'possible' and then backed that up with a 62/100. Some days you're the rooster, others the feather duster!

One left field...

That latter one could be the most telling. Try the rim thickness one as well...

I was part of a conversation a while back where the discussion was not only around weight of the loaded rounds but also rim thickness. They turned a gauge up on a lathe (basically a snug fit hole...