chaz,
I shoot a .266 neck and use either a .2630 or .2625 neck. My necks are nominally 10.5 thous. I also shoot Bart's 68BTs and LT32. My load has been the same for two separate barrels - 29.4 grains LT32 and 9 thou off touch. I'm on my 15th reload and I anneal every other firing or so.
HTH
Dennis