Several years ago I put several loads together using 30/40 Krag brass. I was really amazed at the density of the pattern. I don't remember the powder charge, but it was a very mild charge, I used thin styrofoam for a wad, like you would get from a package of meat, filled with #9 shot and held the shot in with silicone. I tried other ways of holding the shot in, but they would let loose under recoil.
I am out of town right now, but if you want more info, I will try to post it when I get back home next week.
You can trim the 30/40 Krag brass the length of your revolver cylinder one time without sizing because of its factory taper. After one firing the brass will fireform to the form of the cylinder, which now leaves a shoulder. This may, or may not be reloadable as is, it depends on the pistol cylinder and if you can chamber the fired brass again with out neck sizing. Again, I am out of town and don't remember for sure, but I think I used a .41 mag sizer to neck size the brass. You have to use a larger depriming die to deprime, such as a 45/70 to get the primer out. When neck resizing, make sure you do not move the new shoulder back. If you do, the next time you fire the brass, the shoulder will move forward, pushing the brass reward and lock up your cylinder. To cut the styrofoam, I took a .44 brass, sharpend the mouth and used it like a cookie cutter to cut the wads.
I did the same for .38 Special using .357 Maximum brass, but had to neck size first with a 9mm sizing die to let the Maximum brass fit in the .38 special cylinder.
If you want anymore info, I will try to get it too you next week.
Edited to add, this info and the 30/40 Krag brass was used in a .44 mag.