I have had the best luck calling them just at last light or first light with a grey fox in distress tape. A couple of times I have taken doubles at the same set up. I use a 12 gauge with #4 shot. A large caliber rifle will blow a large hole in them. A grey fox will respond very agreesive to a grey fox distress call and you can get them easy within shotgun range. Heres a couple of greyspictured with my son that I took calling one evening here in Indiana at one setup.