The phrase identifies ammunition characterized by superior performance when used in a .300 Winchester Magnum rifle for the purpose of hunting elk. This encompasses bullets known for their weight, construction, and ballistic properties that ensure effective and ethical harvest of the targeted animal. For example, a controlled-expansion bullet with a high ballistic coefficient would fall under this definition.
Selecting appropriate ammunition is critical for successful elk hunting. It contributes directly to humane kills, reduces the likelihood of wounding and losing the animal, and maximizes the effectiveness of the firearm. The .300 Winchester Magnum cartridge, when paired with well-chosen projectiles, has a history of delivering the energy and penetration necessary for ethically harvesting large game at various ranges.