Re: whiich case trimmer and competition dies
"Does Lyman make that DIE in 338 rum.. I see it 338 WIN or how about a redding full length S die"
The Lyman M dies are caliber specific, not cartridge specific. The die for .338W will work fine for your RUM.
I see little benefit from ANY "bushing" die unless the loader has a tight neck that requires turning. But, if the necks ARE truned exactly right, the bushings are great. Otherwise you are only pushing the variations inside and then the bullets have to push them back outside. That's NOT good for best seating, IMHO.
In all honesty, a trimmer is a trimmer. Not very complicated. They all work fine, including the simple, inexpensive Lee case trimmers. I prefer the Lyman Universal trimmer simply because it comes with a set of 9 commonly used pilots AND its universal shell holder is both easy to use and a great time saver.