Speer bullets deliver the pinpoint accuracy and raw stopping power you're shooting for. This particular bullet is part of a broad assortment of heavier rifle bullets, not only the most expensive big game bullet built, but also the most expansive - averaging 92% weight retention. The Grand Slam features Speer's Hot-Cor process, where molten lead is injected into the jacket (rather than inserting a cold lead core) which then adheres together to eliminate core slippage. The result is a more accurate bullet, with more weight retention and expansion.