I think a .72 caliber roundball weighs... 549 grains because they load a .715 ball.

If memory serves me you take your constant of 1502 X ball diameter X ball diameter X ball diameter = ball weight. If you were shooting a .710 ball it should figure to 1502 x .71 X .71 X .71 = 537.5 grains. For instance a .490 roundball for a .50 caliber is; 1502 X .49 X.49 X .49 = 176.7 or 177 .54 caliber; 1502 X .53 X .53 X .53 = 223 grains. Incase you want to figure the weight of a roundball....


have you all got your calculators out?