308 is a close 30-06 equivalent and hence makes the minimum for our group.
Partitions or TSX, either ought to do okay with favorable shot presentation and selection.
Odd that out of 50-some-odd elk hunters who have actually harvested elk that the .308 never made the favorites list even though the 30-06 is a dominant force.

http://www.huntingnet.com/forum/tm.aspx?m=1459421&mpage=17