425-pound

Updated: May 27, 2025

For example, the 10-1/2-inch Armstrong 150-pound shot, thrown by 50 pounds of powder at 1,770 feet per second, has nearly twice the destructive effect upon striking, and four times as much upon passing its whole diameter through armor, as the 15-inch 425-pound shot driven by the same powder at 800 feet.

Various - The Atlantic Monthly, Volume 11, No. 63, January, 1863