Different 120mm guns on the Chieftain, Challenger and the German one on the Abrams and Leopard 2 to be pedantic, but you're quite right in saying these three 120mm guns were far better that the 125mm on the T-72 and T-80.
More pedantry: the British 105mm used subsequently on the M-60 et al was first used on the Centurion rather than the Chieftain, which had a 120mm. I know, I'm an anorak...
More pedantry: the British 105mm used subsequently on the M-60 et al was first used on the Centurion rather than the Chieftain, which had a 120mm. I know, I'm an anorak...
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