I'm assuming you're talking about a rifle load.
My preferred .357 Magnum load in a Rossi 92 rifle is 20.0 gr of Win 296 under a Hornady 125 gr XTP. That's the maximum load in the Hornady 9th Edition manual shot in a Rossi 92, which is a lot stronger than a Henry or 1873.
I get an average velocity of 2210 fps in my 24 inch Model 92 rifle and 2170 fps in my 20 inch Model 92 rifle. The XTP bullets are hard to beat for accuracy and both my rifles produce 2" five shot groups with that load at 100 yards using a Marbles tang sight with Merit #3 or #4 aperture and a Lyman 17AHB front sight.
For a 3" target radius, I zero my Model 92s so that they are 3.0" high at 100 yards. That results in a 155 yd zero, and keeps the bullet within +/-3" of the line of sight all the way out to 180 yards. The MV at 180 yards is still 1370 fps, but it's farther than most folks should be shooting an iron sighted rifle at a coyote.
At 50 yards, that zero leaves the bullet 2 1/4" high at 50 yards, which is pleasantly high enough to prevent you from covering the intended impact point with the front sight.
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If you're talking about a revolver, my preferred load is a 125 gr XTP on top of 8.5 gr of Unique. The maximum load in the Hornady 2nd Edition is 9.4 gr, and while I've shot 9.0 grains I chose to back down to 8.5 grs as the cases start sticking in the chambers above that point, and I prefer them to drop free.
Velocity in revolvers is a little harder to predict as it varies with chamber dimensions and cylinder gap as well as barrel length, but you can count on at least 1200 fps in a 4" or longer barrel with this load.