You can probably count on getting some crawlers on ground hogs with a 17HMR. But lets face fact... you also get crawlers with 17 centerfires, 22 centerfires and even much larger centerfires on GH's, prairie dogs and smaller rat diggers as well at any range. While it may be true that a poor shot can sometimes be somewhat made up for by shooting bigger bullets faster, it still doesn't excuse a poor shot.
I've never hunted our western rock chucks with a 17HMR, the closest rat we have to an eastern ground hog (and still not as heavy as they can get). In the high mountain alpine environs where most RC's are hunted here, ranges are usually just too far for the 17HMR and the winds too stout (and often also too stout for a 17 or 22 centerfire). But on a calm day within range a 17HMR would work on them just fine I think. I've killed badger with my Hummers, and IMO they are a bunch tougher to kill than any of the the rat diggers (including GH's). Shot placement and retained energy (so range) has more to do with what a 17HMR will or will not do than the size of the animal (within reason).
At Digger Wars in 2003 we took thousands of Belding ground squirrels with 17HMR's from 150 to the longest at 359 yards. Beldings are very small when compared to a ground hog for sure - takes two of them just to equal a prairie dog. At the longer ranges they just flopped over dead (no splatter, no aerials), but one I took with my Bullberry carbine at a lasered 309 yards standing broadside through the shoulders was nearly blown in half with a CCI 17 grain TNT. The little pill found bone on contact obviously (I'd post a picture, but while not messy there is gore). Pretty good retained energy at a range most thought was well beyond the capabilities of the 17HMR even for small diggers.
Would I shoot at GH's at 300 yards with a 17HMR? No way. I'd start at the closest ranges possible and only take shoots I have confidence in my ability on, work my way out until my ammo of choice will not take them reliably and set my maximum range back where it will.