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.62x54R Russian Armor Piercing 7H13 (PP) with purple neck and red primer sealant, 7H26 (BP) with red neck and primer sealant. Both of these have U12A type steel with heat treatment, a hardened steel core. So are these the same bullet? 7H37 with black neck and primer sealant and a KB8 (92% tungsten 8% cobalt) tungsten carbide core.
