In my 7mm mag I found that 140 grain bullets were the most accurate with the 165 grain running close second. Both of them were in a Federal Premium. I never had a 150 grain bullet shoot very good in my rifle. Before I started handloading I was shooting a Hornady Custom 139 grain BTSP. These shot as accurate and performed as well and they didn't cost as much as the Federals. Good Luck.