There is no caliber designated 7.62x55. There is a 6.5x55 and several other calibers that are close.
7.62x54R (rimmed) cartridge, used in the Mosin-Nagant and other Russian-designed rifles.
7.62x51, better known as 7.62 NATO, or .308 Winchester
7.65x53, better known as 7.65 Argentine Mauser
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