Speaking of gyroscopic effect, a bullet leaves the muzzle at 3000fps. rate of twist 1:12. spin rate on the bullet is 180,000 rpm. At 400 yards, the bullet has slowed to 2000 fps. What is the rate of spin? I can't say this one keeps me up at night, but I have wondered about it. It seems like the surface tension Delta BC refers to would have slowed it down a little, but not as fast as "drag" slows down the bullet.