 However the ballistic coefficient of equal weight bullets favors .270 caliber bullets over 7mm (.284) bullets of similar design.In the heavier bullets (150gn & above) of similar design the .280 Remington has a slight edge in muzzle energy.With equal weight bullets of similar design the .270 Winchester surpasses the .280 Remington's long range velocity and energy due to the 270's higher ballistic coefficient according to Federal's ammunition catalog.