This sounds to me like the sort of versatile weapon that might be worth buying and storing away for any long term emergency, rather than carrying around in most situations.

Under normal conditions, including any localised or short term emergency or disaster, any standard type of rifle and plenty of ammo to suit might be better.

However in the very long term, even large stocks will eventually be consumed, but one might be able to find or barter ammunition of a calibre that does not fit your weapons.
Possession of a gun that accepts a wide range of ammunition could be literally a life saver.
Worth considering IMHO as a long term doom prep, rather than for routine hunting or defensive purposes. You might never need it, but that is true of many doom preps.