Having shot 308s... both in the military and civilian...
I've never personally owned a 308, when a 30/06 will do more in my opinion...
But owning 260s, since they first came out....20 plus years ago...
I can tell ya this... Started out with 100 grain bullets, with a charge of 43.5 grains of 4064...
that was worked up to, and this was before data was available... I used 6.5 x 55 load data
and worked up...
I've shot several deer at over 300 yds, with a rest... and using a 3 x 9 Leupold scope with
a target dot reticle...on 4 power, I never lost sight picture of the deer during recoil, and watched
it drop like a sack of potatoes thru the scope....
a 308 wouldn't do that for ya...
yet move up to a 140 grain bullet and it will penetrate more than adequately on game the size of an elk...