I'm not one of those guys who says "if you can't handle the recoil of a 300, then you are a sissy girl and need to find a different hobby". Those people, need to go back to kindergarten and start over. Having said that, because of stock design, I believe, the Kimber Montana 300WSM was one of the easier/softer shooting 300s I've ever owned. I did find shooting 150s to be noticeably softer than 180s. Even though my rifle shot 150s, 165s and 180s well, 165 Partitions were my preferred bullets when I owned one and they shot very accurately in mine and were a good balance of accuracy and recoil.
