6mm Ackley Improved question

[wildcat]

Thanks for all the info guys. You guys are correct, speed is not everything, however, I have a 220 Swift and I am using a 40grn V-MAX traveling at 4200 fps. I make consistant hits at 400 and 500 yards with that little bullet. I am not arguing with anybody about BC, you guys are correct about the BC factor. I have been shooting my friends 6mm Ackley, and he is using the 75grn V-MAX in a 1-12 twist. His rifle shoots incredible groups at 100 yards and is deadly accurate out to 1000 yards with that bullet. I have seen what it can do, I guess that's why I am going with that twist rate. I have been reading and hearing that the 75grn V-MAX has a pretty good BC, plus the Mist Factor will be awesome. Anyhow, thanks for all the info.