Also: Patrone SmK (Spitzgeschoss mit Kern) 8×57mm IS
The K bullet is a 7.92×57mm (8×57mm IS) armor-piercing bullet which has a tool 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 World War I. The K bullet had a probability of approximately one-third to penetrate armor 12–13 mm thick up to a distance of 100 meters.
|S.m.K.||Spitzgeschoss mit Kern||Standard steel core armour piercing bullet.
It had a red rim around the primer, on case base.
|S.m.K.H.||Spitzgeschoss mit Kern, Hart||Replaced the tool steel core with a tungsten carbide core.
It had a red case base including primer, from 1939: red primer only.
|S.m.K. L'spur ||Spitzgeschoss mit Kern, Leuchtspur||Has a shorter steel core, and includes a tracer composition. May include color designation such as gelb, German for "yellow".
It had a red rim around primer and black bullet tip.
|S.m.K. Ub.m.Zerl.||Spitzgeschoss mit Kern Übungsmunition mit Zerleger||A very rare practice bullet which self-destructs after a certain distance.|
During the interwar period, Poland produced a copy of S.m.K. bullet designated as P bullet (przeciwpancerny) and own armour piercing bullet with a tracer, designated PS (przeciwpancerny smugowy).
- Fletcher, D British Mark IV tank Osprey Publishing p14
- Dąbrowski, Jarosław. Amunicja małokalibrowa kampanii wrześniowej in: "Strzał" 10/2010, pp. 18-24 (in Polish)
- K98k Mauser Page