You mentioned SHTF scenario?
Well a PCP is the only choice for power-hunting.
There is a reason why all the listed expensive airguns carry a 1 year warranty, they all will eventually leak, and most will experience indexing issues.
So if you have places to get them repaired do a repeater.
If you want to be independent do a single shot. Single shots are far more dependable, can make 50 plus ft lbs (min for hunting), and take long heavy projectiles. Look up .25 Black Mambas!
I have a scuba tank and PCP pump for my .25 Condor. In 10 years I had one leak and easily swapped out an O ring. I have seen so many expensive FXs go in for leak repairs, no thanks.
Me and my buddy's .25 cal Condors wearing .50 cal sniper kits.
I will set up targets at 100 yards any day and make any .22 look like a toy.
At least Airforce offers a lifetime warranty, they are the only ones with confidence in their design while the others give you a typical toaster 1 year warranty...................