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Power Factor (PF) in practical shooting competitions refer to a ranking system used to reward cartridges with more recoil. The power factor is the momentum of the bullet (product of the bullets mass and velocity). Power factor is amongst others used in competitions sanctioned by the International Practical Shooting Confederation (IPSC), United States Practical Shooting Association (USPSA), Bianchi Cup, Steel Challenge and International Defensive Pistol Association (IDPA). The momentum of the bullet will gradually decrease after leaving the barrel, mainly due to drag. == Calculation == The power factor is based around the bullets momentum, given by the formula: : where using SI-units: * p is the momentum in Newton seconds (N·s), or kilogram meters per second (kg·m/s). * m is the mass in kilograms (kg) * v is the velocity in meter per second (m/s) However, in competition shooting, it is common to use imperial units where: * p is the momentum (or power factor) in "kilo grains feet per second" (kgr·ft/s) * m is the mass in grains (7,000 to the pound) * v is the velocity in feet per second (ft/s) Which can be summed up using the formula: : 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Power factor (shooting sports)」の詳細全文を読む スポンサード リンク
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