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Power factor (PF) in practical shooting competitions refers to a ranking system used to reward cartridges with more recoil. Power factor is a measure of the momentum of the bullet (scaled product of the bullet's mass and velocity), which to some degree reflects the recoil impulse from the firearm onto the shooter (see section on limitations).
A PF of at least 175 was needed to qualify as Major within the Power Factor designation used within IPSC competitions. A Minor power factor carried scoring penalties and so there was an incentive to make the Major qualification. As the power factor calculation is proportional to bullet momentum and as the very large proportion of recoil is ...
Minimum caliber for minor scoring is 9×19mm loaded to a power factor of 125 kgr·ft/s while minimum caliber for major scoring is a 10mm (.40") cartridge loaded to a power factor of 170 kgr·ft/s, making for an interesting choice between minor and major scoring taken in mind the differences in recoil, magazine capacity and scoring points.
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