I am new to LRH, so forgive me if I ask an obvious question. I have been playing with a ballistic program, (.280 Ackley Improved), and in general the higher b.c. bullets seem to start to shine at better than 800 yards. My question is, if I was shooting at 400/500 yards, does the higher B.C. and usually heavier bullet, offer any advantages to offset the usually slower starting velocity (than a lighter bullet)? I am beginning the process of building a rifle in .280 A.I., and am debating a 1/9 twist to aid the stabilization of the heavier bullets (160 grain) versus the 140 grain with a 1/10 twist. This rifle is not a true 1000 yard competetion gun, but a lighter mobile toten' gun designed for shots out to 500 yards. Sorry for the confusing wording.