@pnut123 I don't have any specific 270WSM experience to help you but I would start with the Barnes recommended OAL and the Vihtavuori 140gr data for N165. You should be able to go a bit higher with powder charges for the 130gr, depending on what velocity you're seeing and signs of excess pressure. The Barnes data will give you a rough idea of velocities achievable (their data is for 24" barrel though). I would start low and work up in 1gr increments.
This approach works well for me when I don't have specific Viht data for Barnes bullets.
Always start low and work up carefully. A chronograph is very useful.
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Vihtavuori offers rifle reloading data for numerous calibers and bullets for match and hunting purposes. Never exceed maximum loads.
www.vihtavuori.com