I ran my first ladders with 156 today in my Cooper Backcountry 6.5x284 which has a 24" barrel. Using Lapua brass, WLR primers. Since my rifle likes RL23 with the 140s (53.8gr 3088 today),
started at 52.0 2909, 52.5 2938, 52.7 2942, at 52.9 2971 with ejector and slight heavy bolt lift, at 53.5 3011 hit heavy pressure, stopped there.
Then ran a ladder with RL26, started at 52.0 2824, 52.5 2871, 53.0 2891, 53.5 2915,
53.8 2943 slight ejector, 54.1 2975 ejector, 54.4 2981 ejector, stopped at 54.7 3006 ejector mark but no heavy bolt lift.
Appears I should stay with the 140s, and save the 156's for another future rifle!