The Thor™ Bullet produced by OPG Gun Ventures is a patented, full bore diameter, bullet conical that is bore size specific. Being 100% copper, the Thor™ Bullet is not soft like lead, and will not size to the bore like lead bullets when loading. As a result, these bullets require sizing to ensure a perfect fit to your bore. The Thor™ Muzzleloader Bullet sizing pack comes in .50 caliber with 4 diameters of .500″, .501″, .502″ and .503″.
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