Yes, buy Berdan primers.
Edit: You can decap as bearhunter describes above, or use the water method. I just drilled a 1/2 inch hole (ever so slightly bigger just by working it with the bit) in a block of wood deep enough to drop the brass into and be held reasonably firmly, and a smaller hole in the center of that hole all the way through to the bottom, to allow the primer to fall through. Fill the brass with water, drop it in the hole, and give it a tap with something 30-cal-ish
I use a steel 5/16ths rod I bought at Home Depot, sanded it down a wee bit to fit into the neck just snugly, then a tap with a hammer. Works like a charm.
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