Well, PPU makes 7.62x51 NATO ammo as well. 7.62 NATO has slightly thicker case walls and about 1.5 grains typically less case volume than 308 Winchester. PPU sells 308 Winchester ammo as well as 7.62 NATO so what I suspect is PPU just makes one type of brass, 7.62 NATO and uses it for both 7.62 and 308 Win.
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