That's because the .308 is much more efficient because of the smaller case capacity. As a NRA high-power shooter, shooting the .308 was a no-brainer. Mainly because of the choice of bullets that I had. I could load the 125 grain BTHP's for200 yards, the 155 Palmas for300 yards and the 168's or 175's for600 yards. I could also put enough Varget in the case to make a compressed load for all of my bullets. I believe that if you need to make an accurate load, you should try and find a powder that will let you make a compressed load for whatever bullet you'll be using. It's very hard to do that with a 30-06 because of the much bigger case capacity.