The .308 will handle the 180 gr bullet a tad better than the 7 08 will handle the 175 gr. Both will kill elk at sedate velocities. Dropping down to the 140's in the 7 08 and 150's in the.308 with suitable bullets, you will see no dicernable difference. Getting below that you you might pick up a very small advantage with the 7 08. For those who think the .308 cannot do well with 180 gr bullets have obviously not shot many elk with them