I took the Norinco T-54 to the range yesterday. Don't laugh, it's the first pistol I bought, and I still enjoy shooting it. For the uninformed, it's a Tokarev, came into the US with a 9mm barrel and some wonky grips back in the 90's.
I swapped in a 7.62 barrel and picked up some 7.62 Tok ammo, and I've put a couple boxes of surplus through it (70 of Yugo, 72 of Romanian). Nice, accurate shooter, without any issues of note.
Why the caliber change? Well, I think it's neat to have a multi-caliber gun (especially with just a barrel swap to do so), and I'd been wanting to do that for a long time. I came across a decent deal for the barrel, so I did it.
Also, I have a good stash, but I'm hesitant to dig too much into it before things revert back to normal. When I looked around, Tok ammo was cheaper than 9mm, so that gave me justification.