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Old December 9, 2008, 02:56 PM   #2
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 18,486
OK, power factor is muzzle velocity in fps times bullet weight in grains, divided by 1000 to give a three digit number. 165+ is Major, 125-164.99 is Minor. Under 125 is not allowed.

The reason for the 112 grain minimum weight is probably to keep shooters from dinging up the Pepper Poppers with light bullets at very high velocity.

All the factory 115, 124, or 147 grain 9mm that I know of is scored Minor, because they are not at high enough velocity (1435, 1331, 1123 fps, respectively) to reach power factor 165. You have to handload for that. And darned hot handloads at that.

Two more things to know.
1. You may shoot 9mm Major ONLY in Open Divison. Limited, L-10, and Single Stack have a .40 caliber minimum to be even considered for Major.
2. ALL calibers and loads are scored as Minor in Production Division no matter what their power factor.
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