Read an article recently, about neck diameter and tension and how it affected accuracy, where the writer had gone from 0 to .008 to see what difference it made, it was near none at all, except on one of the groups shot, which still was more than an adequate group. So, if you are worried about recoil moving bullets, don't be, not on a 6.5. .002 or .003 neck tension is plenty good enough to hold a bullet in a 6.5 whatever. Cannelure may also just be there to help retain the bottom of the core, take a look at the sectioned pics of that bullet, it will tell you if the cannelure is a cosmetic or a structural item on it.
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