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Brad, CCI Clean-22 uses an exclusive polymer bullet coating to greatly reduce copper and lead fouling in the barrel—without leaving a residue. It also cuts lead buildup in suppressors 60 to 80 percent. Both the Sub-Sonic and High Velocity loads feature a 40-grain round nose lead bullet with geometry that's been optimized for accuracy. Have a great day!

Brad, The primary benefit of the polymer coating greatly reduces lead fouling in the barrel without leaving residue. Additionally this can cut lead buildup in suppressors for up to 60 to 80 percent while providing reliable function in semi-automatic firearms. Federal has similar in 9mm : https://www.budsgunshop.com/product_info.php/products_id/8745/federal+american+eagle+9mm+115gr+tsj+50rd+box

Brad, cci uses a polymer coating Wich creates less lead and copper debri. In short it's not as dirty as most 22lr ammo. Hope this helps.