Allow me to clarify a bit....
I only use RCBS Gold Medal Front Load seater dies for easting and John Whidden bushing dies for sizing. The front load RCBS die has it's seater stem secured to the micrometer thimble with a button shaped allen screw so ichanging seater stems is as easy as taking one out and putting one in and BTW, RCBS offers bullet specific stems for it's GM front load seaters.
I happen to load Bergers and they have an extra long ogive so I machine my own to match the ogive so as not to mar the pill when I seat it.
For someone getting their 'feet wet', Whidden dies are an unnecessary and unneeded expense. When you learn what you are doing, then it's time to invest in some bushing dies with full floating expander balls which result in very concentric ammunition.... but thats later.
I've been doing this stuff for years so I get value from top shelf equipment but I started out with ordinary Lee dies way back when...