Re: spin drift. (Coriolis Effect?)
"You can also be certain that planetary coriolis forces are not going to affect your bullet outside a zero.centered error bar."
Actually, with extreme distance shots (measured in kilometers), there is Coriolis effect present. The effect isn't great enough to avoid damaging something the size of a heart, but it's great enough to prevent an accurate zero reflex shot if not taken into account.
Wind, of course, still has a much greater effect, which can get downright complicated with real world cross winds moving in different directions along long distance trajectories.
As for this not being a fucking neutron star, my back and knees disagree with you in the morning.