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Hodgdon max: 115 gr., 1.125", 7 gr. HS-6, 1234 fps
Kel-Tek P11 with feed ramp intrusion into chamber to .19": 115 gr., 1.168", 10.8 pierce RP primer, 11.2 gr. pierce WSPM, 11.5 bulged case
At 60% extra powder, the real limit was reached for a typical 9mm chamber.