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I've had this sort of thing happen a number of times in my learning curve of reloading. I suspect to an extent we keep on that learning curve indefinitely - always learning new things - for example within this thread, I never heard of such a thing as being able to tighten up loose primer pockets - cool! Might have to lol into that, federal and ppu make awesomely consistent brass but it's soft and the pockets get loose faster. One of my big lessons learned was just how much seating depth affects pressure. Blew the primers out and froze the bolt shut on a .300 win with loads that were well short of max but seated to touch the lands instead of book coal. A side note, a greatly overpressure .300 magnum really lets you know something's not right as soon as you fire it compared to a .270 or my smaller guns.
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