I have 3 6.5mm CMs Savages - two with 26-inch barrels and one with a 24 inch barrel.
The two 26-in barrels really like 142 SMKs and 147 ELD-Ms but shoot 140s (ELD-Ms, Berger Match, LR and Hybrid, Nosler RDFs) almost as well.
One of the two shoots 130 TMKs and 130 Hornady Match well also.

The third rifle with the 24-inch barrel likes the 130 TMKs and ELD-Ms best.
It also shoots 140 ELD-Ms almost as well but 142 SMKs, 143 ELD-X, and 147 ELD-Ms not as well.

I would say that it isn't the model that makes any difference, but the particular barrel.
I would recommend that you try different weights and bullet shapes to see what shoots best.
All my 6.5mm CMs prefer the secant ogive shaped bullets over the older tangent bullet shapes.
Example, all shoot the 140 secant shaped bullets much better than the 140 SMK bullets with a tangent shape.
The amount of bullet body touching the lands seems to make a difference, at least in my rifles.