We have to shoot steel shot on crows here before Nov. 1, and let me tell you it sucks. BB steel 3" mags will kill coyotes, aim at their heads, shots have to be close or a lot of wounding will be the result.
Boommeup, here is a link to a guy that kills a lot of deer with buckshot, he has a lot of loads shooting various chokes. His name is Wade and he uses Lee molds and sharp shooter molds.
He mixes 50/50 wheel weights and Linotype for some super hard buck shot, which gives him the patterns that you will see.
I have yet to load my Tss shot, and if you can afford it, the TSS will outperform anything and everything. Hard cast lead or lead from Ballistic Products will kill well, but you have to work up a load, just like shooting a rifle.