Trying to find a good powder combination for 150gr & 180gr .300 Win Mag loads. Does anyone have a good load data they would be willing to share? I have all the RCBS reloading equipment. I just haven't reloaded for the .300 Win Mag. I did pick up two containers of H1000 today. I saw some use H4350 for the 150gr, but wanted to confirm. I have two identical .300 Win Mag. I am going to site one in for 150gr and the other for 180gr.