Re: Advice Sought on Reloading Rimmed Magnum Cases
"So an FL resizing die and competion seating die is all I need?"
Yes. And normal seaters are usually quite good; it's rare for the only two good comp seaters (Forster/Redding) to add anything useful for new guys, not for a long time.
"What do you think about a neck sizing die. "
I think a neck die for such a cartridge is a waste of money. Most factory sporters shoot best when FL sized so the shoulder is the same, or slightly back, from fired location anyway. Most cases fail due to neck splits so case life isn't helped IF the cases are neck sized in a common neck die; they will be worked just as much as in an FL die. (The ONLY exception to that is Lee's Collet Neck die but even then the case life expectancy difference isn't a lot.)
Headspacing is in the chamber, not the case. We want our cases to fit snug but not tight or loose so knowledgeable handloaders disregard the definition of how any bottle neck cartridge is headspaced, all we need do is size so the shoulder isn't too far forward to chamber nor set back so far the body has room to stretch and cause an eventual seperation at the web.
Part of the advantage of handloading (as opposed to simple 'reloading') is to make custom ammo for our individual rifles, not everyone else's. Meaning, rimmed, rimless or belted, bottle neck cases all need to be sized so the shoulder is set RIGHT to fit your chamber, not according to some esotoric SAAMI specification or 'drop in' case gage for all rifles ever made for that cartridge forever and ever, amen.