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Hornady is showing that the Sub-X bullets are lead core with a copper jacket. So the outer part is copper, but it is not solid copper all the way through.

Eric, no Sir. The bullet is is a Copper Jacketed, Lead Core 190 grain Sub-X polymer tip bullet. --- ((Specifications)) - 190 grain Sub-X polymer tip bullet - Ballistic coefficient G1 .437 - Sectional density .286 - Reloadable brass case - Muzzle Velocity 1050 fps - Velocity at 100 yards 998 fps - Velocity at 300 yards 919 fps - Velocity at 500 yards 856 fps - Muzzle Energy 465 ft/lbs - Energy at 100 yards 420 ft/lbs - Energy at 300 yards 356 ft/lbs - Energy at 500 yards 309 ft/lbs - Use for personal defense or medium sized game.