I've shot boat tails almost exclusively from my bolt guns for years. But lately I've been toying with an AR-15 in .223 and it seems to me I'm getting better groups from flat base bullets than I do boat tails. Does the faster 1-8 twist make a difference ? I'm shooting a moderate load of H322 over a flat base 60 gr Hornady v-max and that loads out shooting every boat tail I've tried. Not that I'm complaining just curious ?