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From an article I just read, BR4, 450 and 41 all have cup thickness of .025 which is .005 over the 400 and are meant for higher pressure. However this could tie into another issue I'm having that I thought was unrelated. My extractor is leaving nice imprints in the case rims. I thought maybe the chamber was rough or had a burr. Now maybe I'm thinking it is just tight. Maybe the teamed used was worn or something. A loaded round chambers and extracts by hand easy enough. I don't know, but a different primer seems like the easy route to try right now, though I plan on sending back to vendor for not riding after break in anyway, so maybe have them inspect chamber at that time.
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