ThisIt depends on why and how you use your guns.
If they are just defensive tools then consolidation is a good move.
If you like having various toys to shoot at the range then varying calibers enhances the fun.
You are leaving out .22 Not sure why. It is very plentifulIf you have any plans to consider possible SHTF scenario/occasions...then sticking to the most common calibers (9mm and .40) will most likely ensure that you don't run out of ammo anytime soon....but other than that if you just like going to the range and have fun, there's not really a major advantage to consolidating....only thing may be cheaper ammo in 9mm if that's really a concern
I need to clarify. Rifle calibers that I own are .223 and .22lr. I have handguns .22lr, .38, 9, .40, and .45. I also have some rifles in 9mm. My thought was to eliminate .40and.45 and concentrate on 9mm. Thanks for all the input so far.
I'd consider having pistol or two in other common calibers (.22, .45, .38, etc) just in case.
Why? Do you need to liquidate the non-9mm's for some reason?
No but the thought is, instead of buying 1k rounds of each, I could buy 3k rounds of 9, and it would cost less.