Rifled gun makes when fired shells itself has a high speed, thereby minimizing the effect of eliminating nutation shells, thus improving shooting accuracy, the greater the distance, the more obvious (3000 m or more). The disadvantage is the high speed part of gunpowder itself consumes energy, so rifled armor piercing fin stabilized goal setting is to reduce the rotation speed of the shells, so that the warhead gain greater momentum.
Smoothbore gun shells fired due to no rifled gun barrel shells can cause rotation, nutation effect and then the shells themselves a great impact on accuracy, so the tail smoothbore gun equipped with a tungsten alloy APFSDS set in order to be able to make shells after collide there is a rotation capacity and improve flight stability.
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