16inch/50caliber Mark 7 gun
The new 16in/50 Mark 7 was designed to resolve this conflict. These guns were 50 calibers long—or 50 times their 16inch (406 mm) bore diameter, which makes the barrels ft ( m) long, from chamber to muzzle. Each gun weighed about 239,000 lb (108,000 kg) without the breech, and 267,900 lb (121,500 kg) with the breech.
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