The Lee Precision Slug Mold is a tool for 12-gauge shotgun users who want to cast their own 1-ounce slugs for hunting. Made from lightweight aluminum for fast and efficient casting, the mold produces a slug with a special drive key. This design feature allows the slug to engage the rifling in a rifled barrel or provides stabilizing spin in a smoothbore barrel, which significantly improves accuracy for big-game hunting. By making your own slugs, you gain full control over your ammunition's quality and performance while also realizing significant cost savings compared to buying factory ammunition.