OldFaithful
Plinker
I'm really just kidding, I try to do the same. I realized that buying a new gun with a new caliber also meant stocking a new round. It can get out of hand.I actively try and keep down the number of calibers..
There is probably only a couple more calibers I may end up with because there are a number of Italian hand guns in them I may end up with. That or I keep looking at the French 1935 pistols in that weird caliber. There is one that keeps showing up at the Stout Field gun show because the ammo is so weird no one buys it. He wants next to nothing for it.
7.65 French Longue
9mm Glisenti
9x21 IMI