Jeff,
I haven't seen it in every example of any particular factory gun, but I have seen it in some examples of all of them. In fact, that's why Federal ended up doing 120-grain Fusion and TSX loads instead of 130s- they couldn't get the accuracy they wanted in enough factory guns with 130s.
Seeing how most shooters likely see the 260 as a "deer" cartridge and the 120gr 6.5mm has a SD of .247, just a bit higher then a 130gr .277 cal and equal to a 165gr .30 it should do just fine. No one ever questions eiither bullet in the other calibers of this SD as being enough for deer.
