DoubleTap Ammunition Lead Free, 10MM, 125Gr, Lead Free, Solid Copper Hollow Point, 20 Round Box, California Certified Nonlead Ammunition 10MM125X A hard hitting round featuring a solid copper expanding bullet. 100% weight retention and extreme expansion make this one of the best defensive bullets available! This is probably the best personal defense load in existence featuring 16.25" of penetration and .86" of expansion.