Re: Zero shift on travel to new location.
I like that phrase-ballistic nerdity! True, true.
Yes, as the link says, it is a very small amount that this effect has, but you're right. There are other factors involved that seem to make up the rest of the voodoo. I wasn't even considering all the other obvious stuff like thermals, wind, and humidity. These have a much bigger effect than this gravity thing, but I would bet that gravity anomalies have more to them than what meets the eye! Murphy's law seems to have it out against shooters more often than not. On top of that, it is awfully hard to make a scientific observation of this phenomenons actual impact because you can't eliminate the other variables in the equation. One little puff of wind at the apex of your trajectory, or one little raindrop falling on your bullet would render the experiment void. If only we had access to indoor 1000 yard ranges at home and at some place 6 degrees north of home!
I will see if I can get some of Pejsa's article on a link or something for you. It is very interesting. He also says there is difference in impact if your shooting west and east! Because the earth is spinning at something like 1520 fps toward the east, a bullet fired from the west to the east at 1000 yards is going towards a LOWERING target that is lowering at 2.62 inches per second! He also talks about shooting at the poles, and shooting north and south. And he throws into the mix firing in different air temps and barometric pressures. I'll tell you more about it later when I have time to type.
If it's not far, it's boring.