Lonnie....
Since everyone is throwing their two cents worth in the pot, I’ll gladly add mine.
Instead of trying to hit a coyote on the run, try to figure out what is making the coyotes run from you. Perhaps the coyotes see you bring your rifle to bear, or maybe there are some trick air currents giving your away position.
If I were you Lonnie, I’d concentrate on improving control of your scent, camo, movement, approach to the stand before I resort to banging away at running coyotes... 
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