Are you going to hunt with this rifle? If you already have a 308 I would look close at the creedmore. It's a nice round for longer kills. only drawback is ammo price. I haven't seen any in bulk form other than 200 rounds. But it's not much higher than 308. It don't have to be a long range gun but if you needed it, you would have it.
I'm 65 and I never thought of hunting long ranges until they clearcut my woods three years ago. I was happy to have the 6.5. But you are right you have more humidity than us here in Arkansas.