diego2fly You need to slug your bore. My H&R Target slugs at .381 The only factory molds you can buy are .379 diameter. I bought the lee 250 grain and have lapped it to throw .381 bullets. I am going to check them for accuracy and if I need to I will take it to .382 factory jacketed loads would not shoot at all in mine. They hit all over the place with some keyholing. Factory measures .374