Asking because local BellasProAss actually has a Savage 110 Tactical Southpaw in 6.5 Meme. And guns in the handedness of Gun Judas are fucking hard to find even in the best of times. But is Mememoore just a fad that is already passing with the PRC's being the new hotness? I know it has seen limited adoption by the military, and my grandpappy said buy shit the military uses, but by army guys who have personal ammo budgets higher than the entire yearly budget of my local sheriff's department. And they can change on a whim should "the mission dictate".
Normally I'd go with .308 because I already stock it for the Cold War Rifle collection, or at least Full NATO. I've avoided Mememoore because if I had followed every trend I'd have a .260 Remington, 6.5 Grendel, 6.8SPC, all of which was to be the next big thing then faded.
I could ask long range shooters, but they're kinda assholes plus sniff the manufactures and guntubers/bloggers farts. Figure autists would be the better perspective.
The thing that would steer me to the 308 would be barrel life. It's something like 2-3x what you get from the 6.5.
With that said, you probably won't have a problem finding ammo in the near future (any more than any other ammo anyway). You certainly won't have an issue finding brass and bullets to keep loading for it. Even a 260 Rem can reasonably be fed.
OP, if I was buying a 6.5 I'd pick a rifle that uses a barrel nut like that Savage you're looking at so I could change out the barrel myself. Even in a bolt action, a 6.5 would only last ~5years of fairly consistent plinking if you shoot for groups, but if you do PRC matches regularly you'll end up replacing barrels nearly every year.