Kevin2---You will just need to try different ones to see which is the most accurate in your gun. Any of them, if put in the vitals will do the job. I didn't mention the buckshot that RR posted about because IMO there are too few pellets and the range would have to be very close compared to the better distance and accuracy you should get with a slug. You do need to remember that both coyotes and even more so fox aren't as big as you think if you've never skinned one out. They have a pretty small rib cage and I'd suggest coming down right above the front leg and putting that slug right on their shoulder for a bigger area and you'll still take out the vitals with it and he should go down right there.