I'm really liking the 243 Weatherby Vanguard S2 I picked up a couple years ago and want to get as much out of it as possible. It's topped with a VX3i CDS/Windplex, like that a lot, too. Just shooting common ammo works pretty good, just killed a lope with it at 395 yards using Remington Core Lockt 100 grain. But since I know it can shoot accurately much further that we now do with it, I'm looking to find better ammo and have come across the concept of "ballistic coefficient" which from what I gather is an important measure of performance. Is it possible to buy factory ammo for this gun with a BC > .4? What is the max BC one could get for 243 ammo?