The success of Grand Slam starts in the jacket. The critical shank section is up to 45 percent thicker than standard game bullets. This section stops rollback at the point needed to retain weight. Ahead of the shank, we carefully profile the jacket to the tip. Near the tip, we add internal flutes to insure expansion over a wide range of launch velocities. The extended jacket protects the lead tip from recoil damage in magazines of hard-kickin' rifles. Then there's the core. It's our proprietary ternary alloy (that means three metals) poured into the jackets molten at 900 degrees F to eliminate oxides that cause core slippage. The cannelure has two functions. It lets you crimp the bullet in the case (recommended for rifles with lots of recoil), and provides additional locking of the core and jacket.