A few decades ago it occurred to me that I had a lot of guns. After taking serious inventory and getting them all sorted out I decided a few things.
1. I have a LOT of different calibers. I mean......a lot. And many of the calibers were just flat out bizarre.
2. In line with the above, I had many obscure and weird brands, styles and type.
3. Most of my guns, at the time, were not collectible, nor were they particularly valuable.
The first thing I decided to do was limit the calibers I wanted. And first on the list to get rid of was .25, .32, 9mm, 40 and a bunch of weird European calibers that ammo was hard to find and expensive when I did. Rifle calibers were also on the list to lose. I decided that I only wanted .22, 30.06, 308 Nato, 5.56 Nato, and 7.62 x 39. That meant getting rid of 7mm, .243, 8mm, and several others.
So over the next few decades of horse trading and such, I ended up with a rather large collection of a lot of guns in calibers I like. In one of my more bizarre trades, I gave up 12 guns for a brand new Springfield M1A. Folks thought I was crazy. In hindsight, I realize it was one of the best deals of my life. That is easily one of my favorite guns. It gets more valuable every day. The guns I traded are lost in time.
Another sweet rifle I have does fall into the "not one of my caliber" rifles. But I really like it. 1873 Springfield Trapdoor with original frog and bayonette. It's in 45.70. I justify it to myself because, after all, it is a .45.
I ultimately decided that I was only going to have guns in these calibers.....and reload them (except .22), .22 .38 and .45 and the rifle calibers already listed.
My wife started to get concerned and said I couldn't have more guns then fit in the safe, so bought a bigger safe.