If I recall correctly, canister was about .69 inches in diameter and for a 12# Naooeon there were 84 (?) per can. The number of balls varied from gun to gun, but the size stayed the same.
Grape was 9 ball/stand, and were about 1 1/4 inches in diameter. And, for grape, the size of the ball varied for the size of the gun. But, again if I recall, there were always 9/stand.