K bullet

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Also: Patrone SmK (Spitzgeschoss mit Kern) Kurz 7.92 mm

The K bullet was an armour-piercing bullet which had a steel core and which was designed to be fired from a standard Mauser rifle. It was used by the German infantry against the first British tanks in WWI. The K bullet had a probability of approximately one-third to penetrate armour 12-13 mm thick up to a distance of 100 metres.