The Rightnour® Bore Gauge checks the bore diameter of any firearm from .15 cal. To .80 cal. Also checks shotgun gauge from .410 to 10 gauge, and millimeters 5.5 to 11 mm.
RMC Ox-Yoke® manufactures RMC Muzzleloading & Ox-Yoke Originals muzzleloader gun cleaning, gun care and shooting products. They're been in business for over 25 years producing quality, American made muzzleloading and blackpowder accessories, supplies, cleaning and shooting products.