At the 2010 SHOT Show, Federal Premium Ammunition introduced a new, deep-penetrating 12 gauge shotgun slug: the Vital Shok TruBall Deep Penetrator.  The Deep Penetrator uses a copper-plated, hard lead core to ensure deep penetration.  The 1 ounce slug is loaded in a 2 3/4″ shell and has a muzzle velocity of 1600 fps.

From Federal:

When you’re hunting animals with tough hide and bone like bear or hogs you need a robust, reliable slug to get the job done. When Federal Premium® set out to make the smoothbore slug more effective for the standard slug slinger, the Vital-ShokTM Slug TruBall® system was created. We’ve reinvented, redefined slug technology and that means you can upgrade without changing barrels. For 2010, we add a new 12-gauge TruBall Deep Penetrator slug. This is much harder (higher antimony) lead than the traditional TruBall and features a more distinct shoulder for extra toughness. They are designed for an impressive 18-20 inches of penetration.