any reason to think about getting a revolver is good e'nuff' reason
(and pleased to hear DMZ enjoys his)
but the hummer is a rifle round, and better served by a rifle length barrel
was a faddish thing for a short while (in revolvers), but you don't see many of them these days, just not a whole lot of reason for manufacturers to do 'em
if 22 LR just doesn't seem quite enough, think about 22WMR
a little cheaper ammo cost than 17HMR, fun, loud, throws a nice flame, can be very accurate (and can be had in poly-V tips, if that appeals, though I think the poly-V not as consistent out of a 6" barrel myself), hits at least as hard as 17s out of handguns, nowhere near the split casing issues and such as with 17s
22WMR revolvers not hard to find, but if looking for quality, think about a 6" S&W k-48, nice, good trigger
not uncommon for rimfire magnums to be a bit sticky on extraction, pretty high CUP for rimfire brass you know, (part of the reason magnum rimfires are hard to make reliable in autoloaders, long or short) but not a real issue if just wipe out cylinders with a soaked patch every 100 rounds give or take
good luck with whatever you pick