Power Factor = Bullet Weight X Velocity / 1000
As we all know, in IPSC, we have to have a minimum power factor of 170 to "make major" and a minimum power factor of 125 to compete. Various charts abound, but this one comes up quickly on search engines.
I went out this morning early and with a standard wax bullet and weighed it on my well-used Hornady scale. My particular wax bullet weighed in at 18 grains. The velocity data was taken last summer in my backyard. So, a quick-and-dirty power factor on my ammo would look like this:
Power Factor = 18 X 729 / 1000
Plugging the numbers into my calculator gives me this:
Power Factor = 13.122
Now, we know.