FO Seaman

In a rifled gun the barrel is rifled with small grooves to spin the round, a APFSDS round does not need to spin in order to be stable as you see in the names FS is Fin Stablized, on the 105mm the rounds where small and less accraute and at times the grooves would fill with metal and or wear away and then must be replaced.



In the Civil War if units had rifled cannons they would look for enemy smoothbore after a battle because it was more accurate and faster.

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