I have 2 rifles in 6.5 x 55. One is a Remington 700 with a Douglas barrel in standard hunting contour. And the other is a commercial Mauser action with a 26"stainless fluted bull barrel, also a Douglas, mounted in a Millett thumbhole stock. These rifles don't agree on much, but they both like IMR4831 and 140 grain bullets. The charge weight is the only thing that they disagree on.
Chet.
BTW, please excuse my brain fart. It's not a Millett stock, it's a McMillin. Duh!