7mm/08. A relatively new cartridge, the 7mm/08 is a .308 necked down to .284. It kicks very little, speaks in a quiet voice, and knocks stuff flat. The ones I've shot have been superaccurate. Although it will handle a wide variety of bullet weights, the best one for deer is 140 grains. Velocities are moderate, so it's at its best inside 250 yards. Works very efficiently with a 20-inch barrel if you like carbines.