I have one being built right now. I purchased a expander madrel with the 30 caliber expander. I just used dry graphite lube and eased into it and it went way better than using the carbide expander ball. Pretty smooth operation. I haven't got my rifle yet. But the reamer being used it based off that round as is. Nosler brass neck's are pretty thick so i am not worried about much. Pretty excited, REALLY excited to send some down range.