RE: 300 ultra mag load
I've had good results with 89.0g RL22, Fed 215M primers, Nosler 180g Partitions, seated .020" from the lands. Velocity was 3230fps, groups under 1/2 MOA at 100yrds. I've got some 180g Partition Gold "molly free" which I'll be working with next-hope their as accurate as the original Partitions!