I am an old shotgun shooter and this has been both good and bad as far as hitting running coyotes is concerned. The bad comes in leading a moving target. For the longest time I could not hit a coyote if it was no more than tip-toeing. If a coyote was moving I'd pull down on the coyote swing threw like shooting a shotgun and miss. I was always told by people that wern't there that I was no dought shooting behind the moving coyote. I'd swing futher threw and was still mising. For years I decided that a oving coyote could not be hit with a bullet. Then I got to thinking about things. Bird shot moving at 1,100 FPT and a 22-250 at 3,800. Using shotgun like leads did not compute. On the next runner I swung threw like I did before but as the cross hairs crossed the front quarter I went for the shot. The coyote skidded on his chin for 15' with a nice neat hole in his chest. I am now rather proud of my ability to hiting a running coyote. Again shooting shotgun gets the credit. Developing a smooth consistent swing and follow threw in all from the shotgun. However a modification of the shotgun lead is required.
Michael
P.S. Rob common man (a disclaimer: I'm writing this for ome fun and not for agression), leave the calculator at home and shoot, shoot, shoot. The calculator can be a fun accademic toy but won't do you a darn bit of good in the field where instinct rules the day.