If you call Swift direct you can probably get good data on the solids. I’ve called them before and Bill was always very helpful.

Barnes data I have shows Re-15 as a good option. Which is good for me as I use it also in my 375 H&H and 338-06.

Nosler has the Partition load data online. Looks like 4064, Varget, and Re-15 are good to go.

He went over yonder way