RE: Antelope Bullet for .243?
Any bullet that shoots accurately in your .243 will likely be fine. Nosler Accubonds, Swift Scirrocos, Barnes TSX, are all great bullets, but you don't need that high quality of a bullet for pronghorns. One of the best pronghorn bullets you can shoot is a Sierra. If you can shoot accurately out to 300 yards, you'll be fine. Chances are that you'll shoot a buck at under 200 yards, unless you don't want to stalk him.