So, my next venture in hand rolling is to move on to turning necks, and using a die with sized neck bushings. I realize that in order to get super accurate, I need to cut the necks and then measure the cases while loaded to determing the proper size. I am going to place the equipment order shortly, and would like to know what the most common say 3 sizes I should get. Also, if there is anything special going on here, would someone with experience give me a quick run down? My exparamentation will be on my .223AI. Thanks