The 7.5 FK caliber ammunition is a proprietary caliber designed and produced by FK BRNO Engineering s.r.o. This caliber was designed specifically to bridge the gap between standard handgun and carbine rifle calibers in terms of power, efficiency, range, and accuracy. While at the same time it's compact enough to be used in a standard size automatic pistol with a 5-inch or 6-inch barrel, and when used in pistols with FK BRNO's patented recoil attenuating system, it has recoil comparable with calibers with less than half the kinetic energy.F ammunition features an all copper monolithic spoon tip bullet. This bullet is designed to tumble after the initial impact and penetration, creating a very large eliptical and deep penetrating wound channel. Accurate and effective for tactical use up to 150 yards and dangerous game hunting up to 500 lbs to 50 yards. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.