It's obviously quite repeatable.

Consider that the muzzle of a rifle barrel moves in a circle as the projectile moves up the bore.

Ever study large caliber naval gunfire control? There's some interesting factors there too...

Hits are a combination of applied arts (aka engineering) in all cases.

The ultimate moving target hit was the Cassini spacecraft entry into a perfect orbit around Saturn. That's also ballistics.

Fascinating, isn't it?

"The price of good shotgunnery is constant practice" - Fred Kimble