Crazycoot, do you handload? If you do, what caliber you can load, set up for? Got the components, etc?
No, I don't handload.
Then the answer is easy. 308 Win.
Ammo for that is available again and should stay that way. With a 150-165 grain bullet and a 200 yard zero, you can hold on hair all the way out to 400 (if you are a set and forget shooter). Lots of great gun options to pick from as every manufacturer chambers their budget and premium offerings in 308.
Easy-peasy
