I'll stick with my SSG 69 in .308, shoots sub MOA out of the box. It does anything I want it to do and I've been shooting .308 or 30-06 for 60 some years so the ballistics are pretty much burnt into my brain. The 150 or 165 grain will put down most anything shootable here, maybe a 180 for Red Deer or Hogs. The Kahles scope is what came with it, I figure the people at Styer (and the Austrian army) know what works.
I like to stick with military size ammo for the simple reason, if the fit ever does hit the shan, NATO ammo is more likely to be available. Battlefields are often strewn with useful stuff.
My go bag has a folding FN FNC (AK 5) in it. Basically a better Kalashnikov, in .223, built for punishment (built like a brick) and cold weather proven. Takes standard NATO (STANAG) magazines. Battlefields are often strewn with useful stuff.
I am a bit paranoid, I've been places that were business as usual one day and turned to chaos the next day. Hope for the best, plan for the worst.