James,
My .260 barrel length is 22 inches. With the Speer Nitrex 140 grain factory loads, I am getting 2,725 fps. The 100 grain Noslers clock out at 3,250. I could probably get higher velocities, but the accuracy is great, and I am happy with the velocity as is. If I could do it over, I would have gotten a 24 inch barrel. The slightly longer length just seems to balance better for me. The barrel is a Virgin Valley custom.
scienceguy