Steel placed at 500 yards are the bread-and-butter targets for PRS and NRL competition, so for these applications the pipsqueak 6mms are the best. That includes the 6 Dasher, 6 GT, 6 BRA, and 6 BRX, along with the 6.5mm and 6mm Creedmoors. For hunting it makes more sense to run with something a bit stouter. The 6.5 PRC, 7mm Rem. Mag., and .300 Rem. Mag. are all capable of fine accuracy and game-killing power at these distances.