"it ain't what's used to make ammo that wins most of the high power rifle position and benchrest matches and set some records along the way.
...The smallest many-shot groups I know of have all been shot with cases full length sized with their neck diameter 1 or 2 thousandths smaller than a loaded round's neck diameter. And they set the fired case shoulder back 2 thousandths. All rounds fired in standard SAAMI dimensioned chambers....RCBS and Redding make (bushing) dies like these. ... (Lee collets) ain't what's used to make ammo that wins most of the high power rifle position and benchrest matches and set some records along the way."
Bart, yes. And those guys virtually always have tight ("SAAMI" ?) barrels and chambers too. Very few winners in any game are shooting normal factory barreled rifles, certainly not the BR shooters. For the significanty looser factory chambers the rest of us use, Lee's neck die does all that can helpfully be done, and do it much easier and at far less cost than any bushing neck sizer. Factory rifles and chambers are as different from serious match rifles as NASCAR Fords are different from our Fords, so their loading methods are much different from what will do us any good. But, needed or not, the fellows selling bushing dies are quiet happy to provide them to those willing to buy 'em.
Properly using a body die and a Lee collet neck die in combo does, effectively, "FL" size. And the sized necks will typically be one or two thou smaller than loaded rounds, that's one of the things I love about that die.
Sizing and setting case shoulders back properly only requires that the loader know what he's doing, no special die is required. Given the normal variations in case hardness and springback, setting shoulders back any consistant and precise amount, to a thousanth, would require a miracle, not a die.
I've never heard of serious BR shooters using threaded dies of any kind in a conventional press other than for case reforming and an occasional "FL" resizing with a body die, but certainly not for their competition shots, have you?