I think this question implies that one is flying solo but who among us would be solo?
I will be with family and very good friends so more than likely we will be having various dual purpose firearms.
A cpl 22lr game getters and trainers, .308 (7.62x51) long range and medium size game stoppers (2 and 4 legged!), 12G for cqb, CZ 75b and others for personal last resort defense and several mosin nagant m44's for hunting also to conserve on common caliber ammo.
Not to mention ar and ak's for patrol type and secuity duty!
You definitely can't forget a good 22lr handgun to train your flock with in handgun usage also.
All this assumes a true SHTF type total collapse of society which I don't think will happen in the immediate future...then again I did see the Katrina fiasco relatively upclose, live in hurricane alley and lived thru tropical storm Allison in 2001 so don't take my 2cents to HEART!...