Indeed the wind drift could be significant at 400, but depending on the actual wind conditions and the size of the “vitals box” you’re shooting at, the difference between a 270 slug and a higher g1 6.5mm slug may well be insignificant. The proposition that some have argued here, however, that the 270 is clearly outclassed by new cartridge developments is hard to support. As a rule, the 270 mitigates the higher BC advantages of more efficient case designs in 6 or 6.5mm by taking advantage of its greater case capacity in using newer, slower burning powders, like Reloader 26, IMR 7977 etc, to produce yet more velocity.
