Not sure what you are looking at but my Nosler #6 manual shows the 06 faster at every bullet weight. In fact according to Nosler the 06 will push a 168 grain bullet faster than the 308 can push a 150 grain bullet. Those numbers take into accound the different operating pressures of the 308 and 06.

Looking at one manual often can be misleading because it shows such a limited view of the powders available at that burn rate.

Real world velocity differences are even greater than the manuals show because the 06 and 308 show the same classic pressure signs at the same operating pressure on average.