For anyone looking to build a Mashburn, I have a reamer that could be loaned out. If I like you and approve of the smith that will be using it. I recommend Redneck.
Want To Buy; Form die for a 7mm Mashburn Super. .284 Hornady AMax 162gr. .224 Hornady AMax 75gr. 22-250 bushing die Bushing die that will work with the 7mm Mashburn Super A couple Glock 42 380ACP mags