Information stolen from this month's American Rifleman magazine.
In reference to the 16" naval gun.
The classification "16/50" caliber means that the gun fires a shell 16" in diameter, and the length of the bore is 50 times its diameter (50x16" = more than 66 feet). Weighing in at about 390,000lbs, the gun has 96 rifling grooves with a twist of 1 turn every 25 calibers. Maximum service pressure of the 16"/50 caliber gun is 18.5 tons per square inch - or 444,000ft/lbs - with typical muzzle energy of 355 mega joules, or almost 262 million ft/lbs. from 28,000yds away, the nearly 2.5 ton armor-piercing projectile is designed to penetrate 16" thick armor plating.
In reference to the 16" naval gun.
The classification "16/50" caliber means that the gun fires a shell 16" in diameter, and the length of the bore is 50 times its diameter (50x16" = more than 66 feet). Weighing in at about 390,000lbs, the gun has 96 rifling grooves with a twist of 1 turn every 25 calibers. Maximum service pressure of the 16"/50 caliber gun is 18.5 tons per square inch - or 444,000ft/lbs - with typical muzzle energy of 355 mega joules, or almost 262 million ft/lbs. from 28,000yds away, the nearly 2.5 ton armor-piercing projectile is designed to penetrate 16" thick armor plating.