George, going back through my 270 notes (I've had 4 of them and am likely getting ready to build another) I found I generally went with 58.0 H4831sc with 150's for an average speed around 2,850 from a 22" barrel. My last Kimber Montana preferred Dober's H4350 load with 150's.
Here are two elk ("where they fell") that dropped to that rifle. A big cow with a 150 Ballistic Tip, and a 10 year old bull to a 150 Partition: