7.62 NATO DuplexDeveloped after the invention of the 7.62x51 NATO cartridge, the M198 Duplex cartrid
7.62 NATO DuplexDeveloped after the invention of the 7.62x51 NATO cartridge, the M198 Duplex cartridge had two 7.62mm bullets, with one seated entirely within the casing and another seated on top. The purpose of this was to increase firepower with each shot. They were rarely used. -- source link
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