Any AR configuration in 5.56.
A good bolt action scoped 308
Any pump shotgun in 12 ga.
Any hi cap 9mm handgun. In a SHTF scenario, your handgun is just an avenue to your long gun.
Any good reliable 22lr rifle/handgun.
What these armchairs never consider is ammo availability, and how much ammo you can transport on your person.
I love these SHTF threads, it offers an opportunity to compare notes with the choices others have made.
I can check off everything on your list except that I opted to purchase an S&W .357 wheel gun (my entry into firearms ownership). Decades later it’s still my favorite of the bunch.
Now if I could just get my hands on a phased plasma rifle in the 40-watt range...