US Battleship USS Maine - Eight-inch Breech-loading Gun

"The 8-inch breech-loading rifle has a weight of 13.1 tons; total length, 25.4 feet; greatest diameter, 28.75 inches; total length of bore, 290.5 inches; number of grooves, 32; weight of charge, 105 to 115 pounds of brown prismatic powder; weight of projectile, 250 pounds. The thickness of steel which the shell will perforate at the muzzle of the gun is 15.51 inches, and at 1,500 yards, 12.36 inches." - Johnston

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