jp-
I used to have a .357 Blackhawk in my collection, but I sent it on its way. It needed to have the chamber mouths recut in order to use cast bullets, and that seemed like too much trouble at the time. It's a nice gun overall, however, and it would serve your purposes. I would recommend Federal Cast Core loads for your trail needs, NOT expanding bullets. I saw an interesting series of pictures snapped of a fish and game guy trying to shoot a bear off with a 357, and it was his last bullet that managed to penetrate just enough to break the bear's neck. The rest of the 158 grain bullets opened so wide and fast that they failed to reach vitals, and one bullet was launched towards the heavens, without hitting the bear at all. The guy lived, and he said that his 22 LR would have outpenetrated the 357, and, considering the headshots he had made, a 22 that could penetrate the skull would have done better than the 357 bullets that flattened out on the bone. Anyway, a trail gun needs to penetrate more than open up, so stick with FMJ or hard cast bullets.
PA-Joe is right, too. A 44 Special load with tough bullets would make a decent choice in a trail gun, and it would be very easy to shoot in the Redhawk.
I load my Redhawk with Keith bullets for trail loads, and my alloy comes out to about 240 grains per bullet before lube. Loaded over a full charge of H110, they have some snap to them, but it's far easier to shoot well than a 300 grain or heavier bullet. A hard cast bullet with decent mass going 1000 fps or faster will handle your trail chores pretty well.
