Harry, if the brass hulls are in otherwise good condition see if you can find a 12 gauge sizer die. Possibly from a cowboy die set Lyman or RCBS. I found mine in a box on a gun show table many years ago. Solid brass cylinder with a rim cut. Lube the hull and drive in with a raw hard mallet and push out with a dowel. i have one hammer gun dedicated to these shells and even so they benefit from a resizing every now and then. They last a very long time and may need to be annealed occasionally. When the mouths start to split the can be trimmed and continue in use. I only use black powder with these loads and the perform very well.
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