Load up on the Hornady .50 Caliber 177 -Grain Lead Ball Ammunition- 100 Rounds. Its cold-swaged pure lead helps eliminate the air pockets and void common in cast balls. The smooth, round surface helps assure great rotation for consistent accuracy, and it is uniform in size, weight and roundness. .The diameter is .490-inches. Hornady .50 Caliber 177 -Grain Lead Ball Ammunition- 100 Rounds - Black Powder Guns at Academy Sports