My S&W Model 30 and Model 31 shoot crazy small groups with 32 S&WL wadcutters but they are fixed sight revolvers.
I have a Ruger SP101 in 327 Magnum that does well with low power loads in 327 magnum cases. That is one of the advantages of reloading, one can tailor the cartridge to the need.
Ditto for the Ruger Single Seven.
A Single Six in 32 H&R would be another good choice but you do not have the option of running full power 327 Fed magnum loads.
An aside, I like to load ammunition for a particular gun with the cartridge it is chambered for, not a shorter version. Just one of my idiosyncrasies. In the past, I did shoot lots of 38 Special ammunition in my 357 Magnum revolvers.
Anyway, we have ground hogs around our small hobby horse farm. The last one was dispatched with my S&W Model 317 (22 LR). It took too many shots to put the ground hog out of my misery.
I've got my 32 caliber SP101 ready for the next one when my availability matches the ground hog's lack of concern of danger.