I have the .280 Ackley Improved and love it. You can shoot both standard .280 for fire forming and then load them up a little hotter than the regular .280. The velocity is approaching the 7mm mag range with less powder and less recoil(not by much). It is one of the most accurate rifles I own. One of my friends has the standard .280 Rem and has taken everything from Coyote to Moose with it. It's a very good cartridge.