Working the MBC formula backwards gives me a CUP max of about 19,200. I would consider this low to possibly mid-range 44 mag.

I have tried 8 grains of power pistol to good effect, but was looking for the equivalent in 2400. Alliant lists a 250 grain lswc keith style at 13 grains 2400 as their max for a 44 special. This load is my next trial, but was wondering if I could bump this bullet a bit with the 2400 to get more into the mag range. They list that same bullet (keith 250) at 20 grains of 2400 with their 44 mag load max. With a brinell hardness of 15 it seems to fall right in the middle of soft and hard cast.

As to lube, it's what comes on HSM bullets. Sorry that I cannot be more specific than that. It is sized at .429.

Any thoughts on bumping it to 14 and 15 grains 2400?