.50 Caliber Round Balls For those hunters who prefer (or are required by law) to use patched round balls in their muzzleloader. These precision swaged pure lead round balls are sized properly to work with any rifle or pistol of appropriate caliber. Used with T/C patches lubricated with Natural Lube 1000 Plus Bore Butter these round balls will give superior accuracy. Available in .50 caliber .490" diameter; boxes of 100 balls. .50 Caliber Round Balls Use with patches lubricated with Natural Lube 1000 Plus Bore Butter.