You still need to have the gun reworked for chamber dimensions. All this reloading business is an attempt to work around the real problem. Since reaming my cylinder I can shoot anything I wish, no problems. In terms of my several guns, Ruger is notorious for defective cylinders, and most have been replaced. I might be different for the regular production SP101, but that is the gun I had to ream, electing not to let them scrap it. They don't have any Single Seven cylinders or either the willingness, capacity, or tools to rework one, so plan B was to ream mine on my own.