DoubleTap Ammunition 9MM+P, 147Gr, Full Metal Jacket, Round Nose, 20 Round Box 9MM147RN DoubleTap Competition delivers reliable performance, and is built for competition shooting, where increased velocity and energy is desired. This ammunition is a popular chambering for competitors in the action shooting sports, including International Practical Shooting Confederation (IPSC) matches, and will increase the bullet energy by 10-percent to standard non +P 9MM Luger ammunition. This ammunition is, non-corrosive, boxer primed, in reloadable brass cases.