I am just going to post this here... Has anyone noticed that .308 ammo has disappeared from the game? I took a couple weeks off New Vegas to play Shogun 2 Total War (great game) then came back to New Vegas. Have been playing it for many hours now. Went to every dealer I know that sells .308 ammo and yet none of them have any. I can't even make it. I have given enough time from inventories to replenish, yet no .308 ammo!
Daniel Contreras at Camp McCarren stocks it in the thousands. 1000+ regular, around 600-700 AP, and about the same as AP in HP. Given it's sniper ammo, I don't really burn through it, but I always stock up from Contreras because it is fairly rare in the wastes compared to other ammo types, especially the AP and HP variety which NPCs never carry. So yeah, keep Contreras around and you can gather a decent hoard of .308. Also the Gun Runners' merchant stocks it pretty frequently, but not in the same volume as Contreras.