I have never used partitions before and am going to try them out this year. I need a good load for the 225 grain Partition. I use imr4350 for everything. (it seems to work great in everything I have anyways.) Also, I do not have a whole lot of time to mess around with different stuff. I have tried several other bullets in my 338 but none of them worked out verry good. I am really hoping the noslers do well. I am open to any and all suggestions. Oh, my rifle is a winchester model 70 and my father has a Ruger m77, both in 338 winmag.