+1 on the 150's. My problem with .308 caliber bullets on the smaller deer and hogs here is getting them to expand before they're out the other side, if you don't have some pretty decent velocity on them.
What kind of speed are you getting out of that 18" barrel?
I shot a big one with a Hornady 178 BTHP Match that I inadvertently loaded. Killed him in place with a shoulder hit. I like a heavy bullet so I can kill them with a Texas heart shot if necessary.