So...I'm playing with this new-to-me XP100 chambered in .350 Remington Magnum with a 16" bull barrel. I'll be using both cast and jacketed, and it occurred to me that I should probably have a Lyman M die for expanding my case necks. Which M die do I use for this? Or is there another expander die that would work as well? I did some internet searching, but didn't come up with any answers for the M die question and I figured someone here would know.
Thanks for the help!
Selmer