alright so im in the process of saving up for my main SHTF gun. I rent a room from my girlfriends father, and we have begun prepping the house for a "bug in" instead of bug out. We see it as the alamo. He has a colt AR and plenty of hand guns and 2 shot guns (1 tactical 1 hunting). Ive narrowed my choice down to two rifles. the mini 14 or mini 30 from ruger. I like the appeal of a 30 cal round (7.62x39) BUT if s*** does hit the fan and there is an ammo shortage we would not be firing the same round so we would not be able to share ammo. Also the way i see it, is if we get invaded (however unlikly that may be) the bad guys will most likely have aks. and if i kill one i can take his ammo. im just looking for a few oppinions on which is the more logical weapon to get. do i want caliber diversity in the house hold, or the ability to share ammo?