Chuckbuster,
The others are right about the coyote vs. fox gig. It's a hierachy of canines and competition for food resources. Not unlike wolves overhauling coyotes found in their territory.
If it is legal in your area and you kill a red, save and freeze the lower portion of it's legs with the fur on. Then when you set up traps for 'yotes, leave one of those legs as a visual...guaranteed 'lollypops for coyotes'.
I've never shot a chuck before but killed a truckload of prairie dogs. But I have seen eagles and large hawks medvac the wounded p-dogs out to there very own dinner date. From the way you discribed the field near the woods, that edge would be perfect for a red fox (or hawk) to lurk. The thinks that make you go 'hummmmmm'?
LNF150
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Pain is guaranteed. Suffering is up to you. Taos Muncy
Tell him the right answer is shifting to a .284-.308, and for the right fee you'll convert his 7-08 so it works a lot better on deer in the brush. Muledeer