For those interested a few facts about the British 17 pounder anti tank gun which was also fitted to the Sherman tank known as the Firefly.
When fitted to the Sherman during WW2 the gun in the later stages of the war used as its main armour defeating round a APCBC with a velocity of some 2900fps this could penetrate 111mm of armour at 2000 yards.
It was so successful that when the new tank came on line the Centurion Mk1 it retained the 17 pounder but used an APDS round with a velocity of some 3950fps this could penetrate 161mm of armour at 2000 yards.
When fitted to the Sherman during WW2 the gun in the later stages of the war used as its main armour defeating round a APCBC with a velocity of some 2900fps this could penetrate 111mm of armour at 2000 yards.
It was so successful that when the new tank came on line the Centurion Mk1 it retained the 17 pounder but used an APDS round with a velocity of some 3950fps this could penetrate 161mm of armour at 2000 yards.
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