Most find out that their gun is more accurate with a load between 90gr to 110gr of powder , BUT your gun is the only thing that will tell you what powder load it likes, My knight disc extreme MHC is rated for 150gr also but with a 300gr bullet the sweet spot is 95gr 2fg 777. But my best overall load is 90gr with a 460gr NEBullshop Conical and I wouldn't be afraied of taking a 150yd shot with this load, but like to keep them @ 80yds or less
I have never owned a ML that would shoot a 150gr charge worth a hoot.