Lorne, the only good coyote is a dead coyote, and the bigger the hole the better!!!
My accuracy load was (is) 57.0 grains of H4350 and a Hornady 140 gr SP Interlock #2630. It is a bit hot, work up to it etc etc.........and it hits like the Hammer of Thor on deer (ask swamp!). But it would not be kind to fur if you are looking to keep the pelts!
Doug