The 30-06 is the best all around caliber and the best at finding ammo where ever you are in the world. Many believe it is the best deer cartridge with a 165 gr bullet and it has 100 ft per second over the 308. It can be loaded at 2800 ft per second, not being a max load. For larger critters such as elk, a 180 gr
bullet at 2700 ft per second not being a max load. For an all around caliber it's the best. For a max load a 190 gr at 2700.
Many feel that the 308 can do the same thing. Sure it can with max loads except with heavier bullets. There is a cross over here, where the 100 fps difference makes a difference for those who don't load to the max. Have you checked ammo for the 308?
Try to find the Barnes x type bullets in 165 grain in the 308
in the gun stores when you need it. But pop in and try to find
a 30-06 load for what you need. It will probably be there.