Pacific tool and gauge carries the 9.5x57 MS chambering reamer. As per the above post, reloading dies are available. Internet search indicates that people have the least amount of problems when forming the cases from 30-06 brass (which is plentiful), and there are lots of 375 molds to choose from. I ordered a contoured 375 barrel blank this morning. Now I need to start scratching together my nickels and dimes for the other stuff. The pool of knowledge on this site and the way people offer good advise is why I really like it. Building a Mauser in this caliber is going to be so much better than a 35 Remington.