I looked into this late last year when I was getting a 6m Creedmoor barrel. If I recall correctly the 10 ELD-M was close to the leade on SAAMI dimension chamber. The factory loaded 108 ELD-M worked really well and the 103 ELD-X, not so good.
Well, I remember the part how it didn't shoot well. I don't recall forming an opinion on where the bullet was positioned with respect to the lands. I may have taken some notes on this if you really want to know. ;-)