Are you planning to shoot Factory Division?
If you shoot factory division, power factor not applicable.
Yes! Thankyou - you guys are correct. 18" version it is then! Carry on.
c. There is no minimum Power Factor (PF) for the Factory division, however the Factory Division hunter’s PF will be used in the case of a tiebreaker. Factory rifles chambered in 6mm/.243 or greater, with a cartridge overall length of 2.700″ or greater (per SAAMI-ANSI Max cartridge length standards), with a maximum muzzle velocity of 3275, will be allowed only in the Factory Division.