Being that you want available factory Ammo, I’d take the 7mm08, even though I’m a big 280 fan and my favorite rifle is my 280. The 7mm08 had more factory ammo options, and is more easily found. In addition to the 7mm08, and also consider a 6.5 Creedmoor. Seems to be plenty of ammo around for them, and they will handle everything you’ve said you plan to do.
