Help with die maker

[Dos XX]

Unless someone tightened up the base diameter on your 300 NMI, then you can make dies that work. The 300 NMI does not have the same problem as the PRC does, actually nothing Im aware of does. The clicker problem with the 300 NM or NMI is because you have to squeeze that case a lot harder than others and too many use a one size fits all approach to die making. Hornady custom shop makes a very good die, so long as you spec it right. BC makes great dies, I have spec'd out a few of theirs including the 300 NMI's.

Man, I read the OP as a PRC. Reading comprehension failure, here. Thanks for clearing it up.