the NATO case is thicker and much more so near the base ,so if you cut the 2 open down the middle the difference between the 2 is readily apparent .something that is rarely ever discussed about these two cartridges ,NATO brass is thicker brass .AND so .. the sentence posted IS the issue ..the stuff that headspaces at 1.635 and is too large for a 308 win chamber . lots of NATO ammo still available and still being used so best to use the correct ammunition in your rifle .
sapishka
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