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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).
Competitors may declare major scoring with a 9 mm (.354") or larger bullet, and the most popular cartridges in the Open division are the .38 Super and 9×19mm handloaded to major power factor. For a while USPSA de facto (but not by rule) prohibited 9×19mm from scoring major power factor in the Open Division due to too high pressures, but 9× ...
9mm Major is a wildcat cartridge of the 9mm Luger specifically for competition pistols designed to handle very high pressure. It is used in practical shooting competitions like International Practical Shooting Confederation (IPSC) and United States Practical Shooting Association (USPSA) to achieve a "Major" power factor, which earns more points for hits in specific zones on paper targets ...
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 proportional to bullet momentum, it is immediately clear that the 9×23mm Winchester had essentially the same power factor ...
Another factor is trauma, like a natural disaster experience or a terrible car accident — something where your life felt at risk. Kids who have a parent with a fear of flying can acquire it from ...
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The Taylor KO factor multiplies bullet mass (measured in grains) by muzzle velocity (measured in feet per second) by bullet diameter (measured in inches) and then divides the product by 7,000, converting the value from grains to pounds and giving a numerical value from 0 to ~150 for normal hunting cartridges.
The USPSA Handgun Championships are yearly championships held by the United States Practical Shooting Association (USPSA) run under USPSA-rules (contrary to the IPSC US Handgun Championship). Sometimes, all of the pistol nationals are held at the same time, other years, they have been broken up between different ranges.