22Mag is a fantastic choice to have in the Rod Locker of your boat, a summertime plinker, and/or anytime a person might come across a <200yd fox or smaller furbearer you'd like to for sure be able to save the hide. From a bolt action IMO/IME the 22Mag feeds a lot smoother and more reliably than an HMR. Those Ruger rotary mags in 22Mag are as close to feed/function perfection as one can have from a detachable mag 22Mag IMO/IME.
.17HMR is similar but really gets it's arse kicked in the wind, is much MORE explosive on small rodents, and is more dependent on proper placement to get into the vitals of larger vermin like a full-sized raccoon, badger, or skunk. Fox are fairly thin-skinned vs. a raccoon, skunk, or badger and the HMR <200yds wouldn't make me feel underpinned @ all.
The B&T Tiger shush's the 22Mag and the HMR down to nothing but the supersonic woosh of air quite well. I've been very pleasantly surprised how much the HMR is moderated by the 'Tiger.