Well, I didn't think think of it. I am just begining to learn.
Another twist is a sloped rail to put your scope in the center of it's optics at a desired or anticipated optimum range. Magnification is always a trade off. The more you magnify, the more resolution you lose. Scopes are brighter at the center of their optics. A 1000 yard competitor wants a rail that will put his optics right on or near center of elevation adjustment at 1000 yards. For .50BMG, a 30 minute rail is usually desired for 1000yrds. There are flatter shooting cartridges, at least to 1000. I believe a 6mm/300WBY mag has a 20 moa compensation to be zeroed a 1000 yards. But it's a barrel burner, and the higher velocity of the 6mm/300 loses out to the higher B.C. of the .50 BMG farther down range.
You don't have to have a B.R. rifle to shoot long range, and as you pointed out that would not be desirable. Your set up would more than likely resemble a varmint rig, such as the barrel profile and the type of stock. To do this right, your equipment will need to be good, and properly set up. You will need to research what works and what doesn't. It won't come cheap, either in time or money.

A Canadian sniper (they are among the best) took out an Al Qaeda terrorist in Afganistan at 2548 yards (.50 BMG), if I recall correctly. 1rst shot cut a cord holding the Al Quaeda's napsack, a correction was made, 2nd shot took off his head. I'm personally not interested in the military aspect of long range shooting, but that is an astounding feat. The military was developing .50 BMG sniper rifles in the 60's, but really did not know what to do with them. The guys involved in the F.C.S.A. early on helped out our Military with the knowledge that they had gleaned from target shooting with the .50 BMG. Now they (and us late comers) are being vilified for owning and shooting a rifle by those who claim it was designed for sniping, when actually it was adapted to sniping from target shooting. Ironic, isn't it.