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Jim Watson · July 30, 2021, 08:30 AM

9mm + HP38 in my guns, the type of primer made NO difference in velocity. Well, RP SP was a smidge faster than even magnums but not much. Is there Secret Pressure in there somewhere? I doubt it, but I am not loading to the maximum anyhow.

July 30, 2021, 08:30 AM	#2
Jim Watson Senior Member Join Date: October 25, 2001 Location: Alabama Posts: 17,704	9mm + HP38 in my guns, the type of primer made NO difference in velocity. Well, RP SP was a smidge faster than even magnums but not much. Is there Secret Pressure in there somewhere? I doubt it, but I am not loading to the maximum anyhow.