Diamond Lifetime
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My dad has one of the 16" rounds test fired out of the Navel ordinance factory in Pocatello Idaho. The 16" guns where designated 50 caliber/16" meaning 16" bore and the barrel is 50 times the length of the bore. The bullet weighs 2700 lbs. 96 lands each about 3/16 deep, it twists twice in its 66 foot long barrel launching the ton and a half projectile up to 42,000 yards