Hornady offers light mag ammunition. Their velocity is claimed to be 2900fps for a 180gr bullet. They say they use a cooler burning powder and a unique loading method to achieve this extra energy in standard calibers.
Cartridge companies often use powders that aren't available to handloaders. If you don't believe that hornady uses a unique loading method, buy a box of their light magnums, pull a bullet from one of the cartridges, then try to figure out how to get all of the powder back in the case
