It should be noted that 7.62x51 mm NATO and 308 Winchester are two separate cartridges. Generally, 308 Winchester is loaded to higher pressures than 7.62x51. You can safely fire 7.62x51 from a 308 Win rifle but not the other way around.
Continue reading History of Winchester 7.62x51 Ammo here: https://ammo.com/brands/winchester-ammo/winchester-762x51-ammo#caliber-history
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