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Hi Jeb yes they are. Here's link with ammo guaranteed compatability for your "308 win" in my 7.62nato chambered ar10https://www.budsgunshop.com/catalog/product_info.php/products_id/3381/Sig+Sauer+R716G2H16BDM+P716+DMR+Gen+2+Semi-Automatic+308+Winchester%2F7.62+NATO+1#guaranteed_compatability
Jeb, 308 is loaded to a slightly higher pressure than 7.62 x 51 Nato but falls well within the Manufacturers "Pressure test" rating of the 7.62 chambered rifles. However I always advocate calling the manufacturer and getting their opinion as they ultimately control your warranty.
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