If you're hunting elk or moose near the end of a rifle's limit, you can turn the same gun into a 30-06 Magnum by doing three simple things:
1. Using Premium Bullets with much higher BC's can easily turn a 30-06 into a 300 Win Mag with standard / less Ballistically Efficient ammo.
Example:
Winchester's 2005 Ammo Catalog says that at 300 yards, a 30-06 Supreme 180-gr. AccuBond has 102 MORE ft. lbs of energy (2,004, p. 11) than their 300 Win Mag pushing standard 180-gr. Super X Power Points (1,902 ft. lbs energy at 300 yards - p. 13).
The above figures are astonishing! especially when you consider the 300 Win Mag's 210 fps MV advantage over the '06. The Magnum's faster moving Power Point bullets only had a BC of .349 - compared to the slower AccuBonds with a high BC of .509. A .160 BC can make a big difference in downrange energy.
2. Consider Federal's High Energy 180-gr. Partitions at 2,890 fps. or Hornady Lite Mag ammo (180-gr. Interlock Spire Points at 3,015 fps) that have a higher MV than a standard 300 Win Mag's Power Point at 2,960 fps. In this case, 30-06 Supreme / Hornady Lite Magnum ammo beats the 300 Win Mag Super X line.
3. A 24" barrel provides higher velocity over the standard 22 inchers; further upgrading a 30-06 into a magnum type round.