My only comment would be that I would not deliberately set up a BR with a .262 neck. that is very thin and only normally used on the PPC. The case necks are subject to damage very easily and no need for it.
I would recommend that if you are ordering your reamer for a 6mmbr, look at some of the threads on this subject at www.6mmbr.com.
Most are recommending that the 6mm BR either be a .271 no neck turn neck or at most .267-278.
I just got a 6mm BR-DX (ack imp) reamer at .269 for new 600 yard gun.