How you doing Darryl? That is a nice rifle!I DO shoot 150 Partitions[as well as 150 TSXs and Hornady 150s] all with 57.0 H-4831sc, win cases and Fed 210 primers out of my Sako Finnbear, and they all shoot verrry good! So, go ahead and use said powder. I'm thinking you will be good to go. Let us know how it turns out. Tom