The ADI manual lists someloads for 180gr in 270WSM
2217 start 59 max 63 2,718 62,800psi
2225 start 62 max 65 2811 63,000psi
Their 160gr loads
2217 start 63 max 66.5 2913 63,200psi
2225 start 65 max 68.5 2989 62,600psi
For 150gr 2225 70.0 3.071 63,000psi so that data agrees with your current load. I'd split the difference between the 160 and 180gr loads start 63gr 2225 max 67?
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