Lighter bullets may fly flatter for a ways, but once you start getting past 500 yds. they are not the ticket. I know this from experience. My buddy had a Lazzeroni Scramjet built up that shot a 100 grn bullet at 3800 fps. It was great out to 500 yds. but then the wind ate it up. I built up a 270 WSM shooting 140 grn. Accubonds at 3200 fps and was pretty good out to 600 yds. Now I have a 6.5-284 shooting 140 grn. Bergers and a 338 Edge shooting 3000 grn Bergers. Neither of these shoot over 2900 fps. But hits out to 1000 yds. and a little beyond are becoming routine. If you shoot where the wind never blows, you are ok shooting light and fast. But if the wind blows at all, you are better off with higher BC. The 270 is my favorite caliber, but until someone starts building higher BC bullets, it won't be my go to caliber for long range.
