I use 22.0g H110 with a 240g JHP and a mag primer. That's Speer 14's starting load, and it works well for me. I prefer H110 to 2400 because I like the greater recoil and muzzle flash. May not be "logical" but it's more fun!
I don't place much credibility to flattened primers. Cratered yet, but flattened with no other signs of pressure at a min load, no issue. Heck, all of my 10mm primers get flattened somewhat.
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