When I bought my first handgun, middle of last year, my thinking was to buy a caliber and stick with that one caliber when I buy additional guns. That way I could stock up on that one ammo caliber, instead of having only a few of several types (ie. 45ACP, 9mm, 40S&W, etc). Now my thinking has changed. My thinking now is that it would be better to have several calibers of guns. You never know which ammo will be hard to get in the future. Right now it's .22, next year it may be 45ACP, then 9mm. Does this make sense or am I over-thinking it?