It just works. I don't knock the custom die makers but I often wonder, what's the real point. Yes, I've had them and it really just seems like an added expense vs spec'ing a reamer that yields a fired case that gets sized the same amount as the custom fitted die, to a given chamber. It just makes way too much sense and it works very well.Count me as somebody that learned something new today. That's a clever way to go about achieving "custom die" performance from off the shelf dies.