I have never played with the 6.5mm vld's so it is hard for me to comment there. The 215 amd 200's shoot very well in my 300WM but the 212gr ELD-X'S consistently shoot tighter for me so that is what I use.
I have always heard that as long as you have decent neck tension it's fine to seat the bullet out to whatever length leaves atleast one caliber diameter of bullet in the neck. In other words for you as long as you have
264 in the neck you should be fine.
You said you had the Hornady chamber gauge, so run a vld to touching the lands, pull it out, Mark the bullet and see how much is left in the case neck. Based on my experience I'm betting there is plenty.
