I've mostly been using R26 and loaded up some R23 today. I shoot 82 grain Bergers in an 8 twist. I've chambered up three barrels, all 8 twist, and they stabilize fine.
I'm getting 3450 with R23. Interestingly, the load with SD of 3.1 didn't shoot as well as the load with SD of 12. I shot a 1.3" group at 600 with 43.5 grains of R23. I've managed to shoot two other groups less than 1.5" at 600 with R26. I don't shoot much for groups at that distance so I have no idea how often it'll do it.
I'm getting 3450 with R23. Interestingly, the load with SD of 3.1 didn't shoot as well as the load with SD of 12. I shot a 1.3" group at 600 with 43.5 grains of R23. I've managed to shoot two other groups less than 1.5" at 600 with R26. I don't shoot much for groups at that distance so I have no idea how often it'll do it.