Re: spin drift. (Coriolis Effect?)
The coriolis effect is a possible suspect as it exerts a small force on an object towards the right in the Northern Hemisphere and towards the left in the Southern Hemisphere. That force will change as the mass of the object changes and this is in keeping with the larger bullet having greater deflection than the smaller one. This is used in many brands of mass flow meters.
It is also why toilet water rotates in a different direction for Aussies (counterclockwise) versus Yanks (clockwise)
Biting the hand that feeds IT
