I have never shot a .308 so I can`t comment.
I have shot deer with a .30-06 and it is a fine cartridge.I don`t think ammo availability will ever be a problem.
I use 150 grain factory ammo in a Remington 700 with a Redfield 3x9 scope.
Works well for me.
I don`t think ammo availability will ever be a problem. I was going to say that also, there are way too many of them that are owned for the ammo to be discontinued. If anything there could come a time were there would be a shortage, but that would require a revolution against our own government.