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When configured with the compensator, the CZ 75 TS Czechmate model is designed to use ammunition that meets the minimum requirements for IPSC major power factor. The minimum power factor for major in IPSC open class competition is 160. Power factor is calculated by the following formula: Power Factor = (bullet weight (in grains) X muzzle velocity (in feet per second))/1000 IPSC minimum power factor for major is 160. USPSA minimum power factor for major is 165.