Before you do that !!! Start (just start) a loaded round through your sizer (minus the primer stem)
and see if that doesn't "iron-out" any near-mouth bulges
Sorry, it's generally bad form to reply to one's own post. But in this case ...
Yep, the crimp was the problem. All the lightly flared/crimped 405grs chambered, locked, and fired without issue.
And after deconstructing and rebuilding the 300grs rounds, all have chambered and lock, looking forward to sending them with confidence.
"All the lightly flared/crimped 405grs chambered, locked, and fired without issue."
This was a function fire test only, and it passes the test. No failures of any kind. That's good enough for me at this point, granted a pretty low bar Ongoing will be "normal" load development and accuracy testing.
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