| Like I siad, you loose muzzle-valocity with the Rifled guns....The older guns(105mm) mostly were rifled, but I think they gave it up with the 120mm ammo being so powerfull anyways...Costs more to rifle..... The Russians had rifled guns 2(as I know) up to the 115mm which was a smooth bore. The brits used a 120mm rifled on the Chieftain NBT, making it the first western tank with a 120mm, and continued using the Rifled 120mm on Challenger I and II.
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