I like the 7x57 a lot! Seem to have accumulated more than I actually need, but each rifle is "special". It has become my primary do-anything cartridge of choice. Last season I took my first wolf with one.
I have a Brno 22f carbine, a couple of Ruger #1's, and a couple of German combination guns in the rimmed version, a Merkel BBF and a Krieghoff Drilling. The shotgun barrels in the German guns are also chambered for a classic and capable round, the 16 ga. Like the 7x57, the 16 ga. is no longer popular, but is "just right" for many hunting tasks.