22hornet

if you get a neck sizer die, once the brass is fired in your gun the first time it expands to the internal dimensions of YOUR gun. then the neck sizer die just shapes the neck (the first 3/8" or so)of the case only. so you have brass that is a custom fit for your gun ONLY. not a round that will fit every gun ever made in that caliber by all mfgr's in the world. plus it extends brass life as it will no longer expand as much anymore once fired and be more consistent and accurate, plus it's cheaper. win/win all the way around imo, unless you got a bunch of guys all using the same caliber.