The .17 HMR is a really nice varmint gun. Its not good if your into cleaning for the fur. It can really damage a racoon or coyote unless you find the head.
The 30/30 on the other hand there will not be much left. A body shot on a coyote is a quick death. The 30/30 will travel much much farther and be less effected by wind. Our .17 is really effected by wind. The bullet is really light compared to the 30/30. 30/30 center fires are expensive compared to the .17 HMR rim fire.
There is now a .17 supper win mag that is rim fire and has more punch but it is new and was very hard to get amo a few months back. This would have been out choice for coyote gun but the difficulty getting amo put the damper on that. The HMR is still doing the trick.
Cheers Don.