I wonder if the terminal performance of the HK MP7 PDW 4.6 x 30 mm been evaluated, and I wonder if the cartridge has yielded any field reports yet. I don't doubt that it will punch through a SAPI plate, but I wonder what it does on the other side, or against an unarmored target. Just guessing, but it would seem to be in the same category as the 5.7 and the .22 Magnum, but perhaps the higher velocity will make a difference in terminal effectiveness [?].
The 4.6x30mm ammunition is loaded with pointed all-steel bullets with brass jacket. Bullet weight is 1.6gram (25 grains) and the muzzle velocity is 725 m/s (ca. 2400 fps). Manufacturer claims the 100% penetration of the CRISAT bodyarmor (1.6mm of Titanium plus 20 layers of Kevlar) at the distance of 200 meters.Other types of ammunition, including tracer, frangible, spoon-tip(rapid-tumbling for use against unarmored human targets), blank and trill(inert) also available for MP7A1; ammunition is currently manufactured in UK by BAE Systems / Radway Green plant.
http://world.guns.ru/smg/de/hk-mp7-pdw-e.html
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