I stick with common, old calibers for sidearms. I could list why I don't have this one or that one, but to keep it short, all of my defense pistols are 9mm or .45ACP.
Does ammo price and availibity play a role? Of course, my last 1911 purchase was a 9mm. It costs the same to feed today as my .45 did ten years ago.
My go to gun in an AR15 in 5.56, I also have an AR in 9mm and .45ACP. The .45 doesn't see much rangetime.
Of course, I have a handful of .22s, including another AR15, but they havent seen much rangetime in the last few years either.
Even though the 1911 is my preferred platform, most of what I shoot is 9mm from my Spartan, AR, Glock 19, or K9...
My only shotgun is a 12 gauge. With the various loads available, I don't see any reason for another caliber.
I dont hunt.