BP shot shell reloading

[Fogman01]

I am going to try some loading some black powder 12 ga shot gun shells. I have the 12 ga brass hulls made by Magtech, the wads, the large pistol primers, shot, etc. I did the conversions for 3 drams to grains and get 82 grains of BP. These shells are just for trying out at the trap range. I have some Schutzen 3F for my cap and ball guns. Will this be OK? What loads do others use. I have a rather inexpensive but modern Spanish 2 3/4" side by side with external hammers that looks like a 19th century scatter gun ... but I wouldn't shoot anything in it that wouldn't be OK for an actual older gun or Damascus barrels.