Most common for those that don’t know: 9mm & .40 for handgun, 5.56/.223 for rifle, 12ga shotgun. (These are the calibers used by police & military in case you need to ‘borrow’ ammo in an emergency)
7.62 & .308 are probably next up in rifle, then .380 for handgun…22LR is another good one to hoard.
Most common for those that don’t know: 9mm & .40 for handgun, 5.56/.223 for rifle, 12ga shotgun. (These are the calibers used by police & military in case you need to ‘borrow’ ammo in an emergency)
7.62 & .308 are probably next up in rifle, then .380 for handgun…22LR is another good one to hoard.