Not the same but a comparison point.
My 6.5CM with a pretty safe load of 2209 is doing 2680 with 147 eldms. I'd imagine 156s in the 6.5x55 should be able to get near 2700 with the additional case capacity.
If you start playing with different powders (RL26, superformance, staball6.5) then 2700 would be easy.
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