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No matter the pattern I cannot recommend steel for coyotes...
Penetration and performance is very poor...
Many years ago, when steel shot was first required for waterfowling, I did a test with some steel handloads using BBB shot and some lead handloads using lead BB's with my 10ga. The steel loads were running about 1500 fps. at the muzzle, while the lead was probably running in the neighborhood of about 1250 fps.
The target was a sheet of corrugated steel at about 40 yards. The upshot of the test was that the high speed steel BBB's bounced off, leaving large dents, while most of the slower lead BB's blew right on through.
Recently, I got to see some computer generated data on the energy generated by large steel shot, and it appears that steel BBB's at about 1550 fps. have about the same energy at 50 yards as do lead 2's at about 1300 fps. At the same range, steel T's at the same 1550 fps. have the about the same energy as lead BB's at about 1300 fps.
The problems with using steel are twofold. The first is that when you use the steel pellets which are big enough to hold their energy down range, they are so few in most loads that the patterns are too thin to be usable on a land animal at those longer ranges. And, secondly, due to the low density of steel, the energy drops off so fast that they quickly become much less effective than lead as the range increases beyond 40 or 50 yards.
Of course, that's not to say that you can't use steel shot to kill predators, but it's a poor second choice to lead or the heavier than lead alternatives.