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A spinning bullet breaks the air better, and missles have guidance systems so they don't ususally need to spin. i suspect the spinning helps trajectory a little like a bicycle wheel spinning help to keep the bicycle upright, angular momentum. something like that (mentor, correct me please, if i am wrong) apr 3, 2004. Bullets spin when shot from a rifle or handgun. Rifling causes this spinning. The spin rate of the bullet depends on the twist rate of the rifling.