I have used my RCBS casemaster guage to get an idea of neck thickness variations. I can say that I am not very confident in the accuracy of this set-up,...it seems to leave the case unsupported and "hanging" off of the rod which the neck rests on, while the sleeve drops onto the exterior of the neck with the mic setting on top of the sleeve. Anyway,......I am interested in cleaning up the necks on my Lapua brass, just to feel certain that I have eliminated any neck issues relating to my 280AI accuracy issues I have been posting in reference to. What is a good neck turniing set-up that you have used? Is the guage necessary (I would rather have it unless there is just no reason for it). I have been told that the drill method works, but for some reason that doesn't seem like it would be as concentric and supported, but this is just a guess as I haven't done any work with either one. Thanks for any suggestions.