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It does concern me, however, that Speer recommends a magnum primer for 296/H100 and a standard primer for 2400
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IIRC, Speer made the switch in recommendation in #13 saying that their testing gave better results with standard primers. I've used both standard and magnum primers fairly interchangably in most of my shooting applications depending mostly on what I can get hold of most inexpensive. I just advise backing the load down and working back up if you make a primer change.
I'm not sold out on a specific brand primer, though lately I've been using CCI pretty extensively after getting a great buy on a larger quantity. I walked into a local shop several months back and found they had a decent stock of CCI primers for $20/k, which around here is a steal. So I walked out the door about $200 poorer, but I'm well stocked on primers for the immediate future.