Many organized shooting sports require ammunition to achieve a minimum power level to qualify and be scored in a specific division. This is known as power factor. Power factor is calculated by the formula: bullet weight times velocity divided by 1000. Power factor requirements are determined by which division one competes in, and might be caliber specific.
A common distinction is between “Minor” and “Major” power factor, and it determines the score value of peripheral hits. For example, in some divisions of USPSA competition, in order for pistol ammunition to qualify for Major, it must be at least .40 caliber and achieve …read more