Along with a new Lyman 452460 mold, the little brown truck of happiness dropped off an RCBS neck expander die. I don't know if these are new, or I just stumbled onto them. Anyway, the die itself is universal and comes with one plug of your choice, and you just buy the different size expander plugs to suit your needs. I shoot a lot of .30 and ordered the die set up with a .309 plug plus a .310&.311.
It's easier to set up than a Lyman M die and does a much smoother, nicer job. RCBS did a good job on this thing. $25.00 for the die w/1 plug, and additional plugs are $10.00 each from Mid-South Shooters Supply.