They're good for woodchucks and squirels. The bullet is too small and too fast, lacking frontal mass to penetrate into game with any meat on its bones. Ive lost fox with 17 HMR's with well placed shots. Not a bad caliber. But not one I continue to use. They really drill that tiny bullet at the target like a laser beam. As a result, the bullet tends to explode on impact. In the case of head shot ground hogs, good. In the case of wanting to preserve the hide of a larger furbearer, bad.
Not a bad round. It has its place, IMO.