These built-up guns were 66 feet 8 inches (20.32 m) long—50 times their 16-inch (406 mm) bore, or 50 calibers from breechface to muzzle.
With a full powder charge of 700 pounds (320 kg), the guns were capable of firing a 2,110-pound (960 kg) Mark 3 armor-piercing shell with a muzzle velocity of 2,800 feet per second (850 m/s) firing out to an effective range of 44,680 yards (40,860 m).
The Army used a reduced charge (672 pounds (305 kg) with Mark 3 shell or 648 pounds (294 kg) with Mark 12 shell) and either a 2,110-pound (960 kg) Mark 3 shell or a 2,240-pound (1,020 kg) Mark 12 shell, for a muzzle velocity of 2,750 feet per second (840 m/s) with the Mark 3 or 2,650 feet per second (810 m/s) with the Mark 12.
The range for the Army version is listed as 45,150 yd (41,290 m) but it is not clear which shell and charge this is for.
These built-up guns were 66 feet 8 inches (20.32 m) long—50 times their 16-inch (406 mm) bore, or 50 calibers from breechface to muzzle. With a full powder charge of 700 pounds (320 kg), the guns were capable of firing a 2,110-pound (960 kg) Mark 3 armor-piercing shell with a muzzle velocity of 2,800 feet per second (850 m/s) firing out to an effective range of 44,680 yards (40,860 m). The Army used a reduced charge (672 pounds (305 kg) with Mark 3 shell or 648 pounds (294 kg) with Mark 12 shell) and either a 2,110-pound (960 kg) Mark 3 shell or a 2,240-pound (1,020 kg) Mark 12 shell, for a muzzle velocity of 2,750 feet per second (840 m/s) with the Mark 3 or 2,650 feet per second (810 m/s) with the Mark 12. The range for the Army version is listed as 45,150 yd (41,290 m) but it is not clear which shell and charge this is for.
16"/50 caliber Mark 2 gun