I have a couple "ground goffers" that decided to make a home under the steps of my back porch. I want to get rid of them, and thought about using my .38 Special revolver with shot shells. Rather than buy factory at $2 a pop, I might try reloading as I have all the components on hand. I will make shot cards out of cardboard. But my question is, since there will be no lubrication between the lead shot and the bore, will I get excessive leading? Or will only a few shots be ok? Thanks.