Thanks for the replies guys,
I'm planning on using heavy cast, gas checked HP bullets at subsonic velocities for quiet hunting and 235 TSX or Speer Hot Cores in the same weight for 100 to 300m.
Should be short, light (hoping for 7lbs or less) and quiet.
edited to add, I found a thread on a lightweight 375WSM
This is exactly what I am trying to achieve
"Shot my ultralight 375 WSM for the first time"