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Originally Posted by Kayback
IRL it fires a 2lb (+/- 1kg) HE round at 2800fps, with a ceiling of around 8000'. Not bad, but against a destroyer? The 1.9lbs AP round would be slightly better, but only just. It's penetration is at 0 yards-2.7", 2,000 yards-1.2", 4,000 yards-0.60", 6000 yards-0.45". Os to punch 3" of steel armour you'd have to basically have your gun barrel touching the enemy ships
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I'm not sure where you're getting "3 inches of steel armour" from. In terms of armor plating, the average WWII era destroyer didn't wear much 'cept for a smile. On a Fletcher-class destroyer, for example, the high tensile steel plates at the waterline midships were only about 7/10ths of an inch thick. Below the waterline, they were only about 1/2 inch thick. Not a whole lot of stopping power.