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An excellent all-copper are the Knight Bloodline bullets, which I hear surrender the biggest blood trails.



Its pretty obvious the Bloodlines are made from UNSC3600 brass.
http://www.knightrifles.com/product-category/muzzleloader-bullets/bloodline-muzzleloader-bullets/

http://www.lehighbullets.com/products.asp?cat=31

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Material - UNSC36000 brass