I messed with some numbers awhile back and it seems to me that the "gains" (essentially meaning lest drift) of increased BC tend to level off.

Not sure if my method was scientific or even appropriate for the idea, but I used a 150gr bullet at 3,000 FPS and ran drift at 1000 yards.

.1=542"
.2=264"
.3=168"
.4=144"
.5=83"
.6=64"
.7=53"
.8=45"
.9=39"
1.0=34"


Anyway, I'm no Brian Litz....but I stayed in a Holiday Inn Express once.