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https://www.budsgunshop.com/product_info.php/products_id/712017583 This site list it as steel cased, I believe the buds description calling it brass cased is a typo. https://alamoammo.com/no-category/7.62x39-brown-bear-196-grain-bimetal-fmj-subsonic-steelcase-20-rounds-m-id-asub762fmj-upc-4607094863472 I checked a few more sites to be sure and they all say its steel cased, it also has a lead core and i know some ranges only allow lead free bullets
Winchester white bix is probably the cheapest brass 7.62×39 you'll find in stock here https://www.atwoods.com/winchester-white-box-7-62x39mm-fmj-123-grain-20-rounds.html