Claim: The K bullet had several versions like the S.m.K. which was a standard steel core armor piercing bullet with a red rim around the primer, and the s.m.K.H. which had a tungsten carbide core and a red case base.
Evidence: The Germans made several versions of the K bullet during World War I and World War II, including: S.m.K. Standard steel core armour piercing bullet.
It had a red rim around the primer, on case base. S.m.K.H. Replaced the tool steel core with a tungsten carbide core.
It had a red case base including primer, from 1939: red primer only.