I use 180 gr Rem Coreloks, I tried the partition but they didn't shoot well in my gun. Win M-70. My buddy shoots a Tikka hunter in .300 Wm and he likes the partitions. We both use 75g of Imr 4831. I have shot .5" groups at 100 yds out of my gun with this load at 100 yds from the bench. This gives me a Mv of 3000 Fps.