I have been centering all my new purchases on the .40S&W and 10mm calibers. I was considering getting rid of my guns in all but a few calibers but then a thought occurred to me. This is a very remote possibility but it is something I thought about. Lets say we have some natural disaster or other type of disaster which leaves us in a rough spot. If we limit our guns to one or two calibers we might end up out of luck if we have find ourselves out of ammo for one reason or another. Maybe we used it all, maybe it was stolen, or maybe it was lost in the disaster. I was thinking it might be nice to keep one or two guns in all the more common rounds just in case that is the only ammo we could find. Such as if we were having to travel with our belongings and we come across a stash of 9mm ammo or if someone we are bartering with has 9mm ammo for trade. If all we have are .40S&W guns we would be out of luck. Is it better to consolidate or cover the bases? seems like these would be two very different philosophies. To which school of thought would you subscribe?