I keep and store a good amount of ammo. Over the years I have had a lot of guns in a lot of cal. I now have a far number of guns but in limited cals. So here is my list:

40 S&W 180 grain HP

30/06 I have hand loads from 110 gr. to 200 gr. (I still believe that the 30/06 is the best long gun cal out there. I know I will get some feedback but nothing else I know is as flexible. With one riffle you can go from mid sized game to moose.)

.223 72gr. MHP

12 gauge: I have stores of ammo from #8 to #00 buck and slugs. (if I had to take just one gun)