Champion.
I had a Ruger m77 MarkII 260 Remington rechambered for 6.5WSM not long after the Short Mags began. I have a Win M70 Coyote in 7mm WSM but either the gun got heavier or I'm getting older,:D so I thought what the heck. I needed a new toy.gun) Shooting original factory 22" barrel with 1 in 9" twist. Nice light rifle. My primary use for this gun is dispatching Pa whitetails @ ranges from 50-600 yds though I know it would work for other purposes.
The load that works quite well for me on paper uses the 140 berger hunting bullet on top of 65.2 grs of H1000, Winchester cases necked turned to .0145 and a .290 bushing that gives .003 neck tension and Fed GM210M primer. I am getting 2980 fps and printing 3/4" ( and a little less on good days} groups consistently at 100 yds. At this charge I am not seeing any pressure signs whatsoever. In fact I went heavier but the groups opened up, still with no apparent pressure, so I backed off. Please remember to back off of this load and work your way up if you decide to try it.
This fall will be my first chance to harvest a deer with this particular load, though my boy killed several with it using 129 Hornady SST's. What a mess!
I e-mailed Berger and they say that this load should perform well for what I want.
Good luck