RE: .177 for Foxes???
Uh, hell no. If you can hit the bottom of a coke can at 50 yards almost every time, then you can shoot it accurately enough, but there is no way it will have enough energy. At 50 yards that pellet is probably going less than 500fps. Maybe at less than 20 yards if you shot it in the head, but by no means should you try. I would give you a 99% chance of wounding it so that it would die a slow painful death by infection, if you even hit it.