Went calling yesterday afternoon. As I was moving to a new location saw a Red Fox standing looking at me as I rounded a bend in the trail. Grabbed my Sportster in .17HMR. Was shooting CCI ammo with .17gr Nosler TNT bullets. Hit the Fox standing broadside at 150 yards. Fox ran off, but had blood in the snow. Started tracking Fox, followed it for about a mile. Finally got a close shot at 30 yards, and killed it. Found the plastic point of the first bullet stuck in a rib. Some bullet fragments stuck in the meat around the rib.
I was very disappointed thought the .17 HMR would do better than that on a Red Fox, since they are such delicate creatures anyway.