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What Does It Mean to Bump The Shoulder on Rifle Cases

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I use a 38 special case when measuring my 30-30. I have bumped them but I generally don’t. I prefer absolute sure functioning to increased case life.

Here’s a test I did that you might find interesting. Course, 30-30 is lower pressure and that matters. But still. Not every time someone resizes the max amount are they looking at minimum reloadings on their brass.
https://www.thehighroad.org/index.php?threads/30-30-case-life-test.896133/
https://www.thehighroad.org/index.php?threads/30-30-case-life-test.896133/

I was bumping back my shoulder to the max, something like .038. That’s a bunch.
 
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