Most people I know that shoot IDPA SSR, ICORE, or steel use 158gr Berry's RN. I used to use 158gr BBI's but they don't appear to sell them anymore and I had issues with chambers getting gummed up really quick. After I started using MG CMJ's for 9mm and asked if they would ever offer CMJ RN bullet for .38/.357. They suggested I try the 142gr FMJ, but I haven't got around to it.