I remember a test, that was done by the American Rifleman staff, decades ago.
They had a jacketed bullet load, that pressure tested at 35,000 CUP. Seating the bullet 0.050 deeper brought the load to about 75,000 CUP.
As stated above, it is a TINY case, and small variations make LARGE differences. Not a cartridge for the beginner.
Back when I started loading the 9mm, about 50 years ago, the brass case thickness was wildly variable, and I found that a strong "press" check was necessary, to insure no bullet set back.
I also endeavor to size the snot out of the case, so there is a small ridge, at the base of the bullet. No bullet set back then.
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NRA Instructor
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