The part about the separation and hard bolt lift is a bit spooky, although I'm also wondering about the level of primer flattening you are observing, and how old that brass was. Primer flattening isn't always a pressure sign. On a rimmed cartridge a slightly flattened primer isn't all that uncommon due to rim thickness and chamber cutout variances, no different than a belted case in that respect. Wondering if it isn't maybe just a brass issue on an old case caused by die settings as well. You say the separated case was a reload,, was it an old one?, were other questionable loads on old cases or some of the once fired you had?
FYI: Speer was one of the manuals that used case measurements, Ed Matunas wrote some of those older books and he later admitted in an article, that they had not used a CUP tool on some stuff in there, just extrapolated it to CUP. Although, you'd think a listing with L'il gun should have been tested with the newer methods, seems somewhat odd it would show CUP, L'il Gun isn't that all that old of a powder.
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