As for me, I finally found the load for those 64 GR Nosler BSB’s. It did take a while. It turned out that the magic load for 65 gr Sierra GK’s was the magic load for the 64 gr BSBs. Lapua brass, CCI 41 primers, 24.3 gr of H335 (work up to it).

I was having trouble with the bullet until a fellow said to start increasing the COAL. That did it. I suppose the bullet is sensitive to seating depth.