The unique, free spinning SpinJag follows the rifling improving loading for more accurate shooting with your muzzleloader. The SpinJag Loader is designed with minimal clearance between the it and the barrel, meaning there is no room for a patch. The SpinJag Loader will load better, allowing the bullet to spin and not damage the tip of your bullet. The SpinJag will load a variety of bullet shapes, from round balls to polymer tipped bullets. Note: If you shoot Parker Productions Ballistic Extreme or Match/Hunter this takes a different SpinJag.