I like the 5.7 and the 10mm, just for fun, never use it for carry, there are better rounds (I don't hand load) and they're expensive. But, they're fun to shoot
Also like .357 Sig since it has more oomph than 9 and I shoot it better than .40 (I know people love to hate on that cartridge).
Not sure those count as "oddball" calibers but they're unusual for me.
Wouldn't mind a .327 I'm just worried it would go away and I don't reload yet. That and I think to get the performance you need the 3 inch barrel and I just like the shorter SP 101 versions...