Ok, this kinda ties into my post about a sizer bushing for a 260 AI, but i really can't figure out the #'s. If a chambers neck dia is .298, as in the 6.5x284 Win. and the Norma 6.5x284 is .300...(per another post) why is the new brass neck dia , both lapua 6.5x284 and Rem 260 measuring .291 loaded? Everything i read , and all of the help i have gotten says to neck size .002 under a loaded rnd.s od neck dia.That figures out to sizing the neck around .009-.011 each time......is this the norm? Some have said no, but alot of what i read shows these #s (.298 neck chamber) as the spec....been in this game awhile, and i'm STILL learning new facts every day!!!!! Thanks for any help....rsbhunter