Actually they are both the same bullet per grain weight of course. The case is the difference. Powder loads vary but when you get into ignition and expansion of the load, this is where the .308 has less space thus running 10 grains lighter on the powder of the 30-06 BUT only 100ish feet per second slower.
All that being said if i couldnt have my .308 im am quite happy letting my 7.62X54R really reach out and touch something![]()