Kirby recently built me a 6.5 WSM on a Win 70 using a PacNor 1 in 9" polygonal for antelope and coues.
I have been playing with the 130 Accubonds and 130 Scirocco IIs with H1000 and Ramshot Magnum Powders, Federal 215M primers, and WW 270WSM brass sized down.
With the 130 Accubonds and H1000, velocities went from 2857fps with 58.0gr to 3240fps w/ 66.0gr (about 40fps increase/gr).
With the 130 Accubond and Magnum, velocities went from 2861fps w/ 59.0gr, to 3087fps w/ 65.0gr.
Using the 130 Scirocco and H1000, velocities went from 3075fps w/ 63.0gr, to 3198fps w/ 66.0gr.
Using the 13 Sciroco and Ramshot Magnum, velocities went from 3088fps w/ 65.0gr, to 3253fps w/ 68.0gr.
Most accurate has been the 130 Scirocco w/ 66.5gr Ramshot Magnum. I am still playing around with seating depth.