I'm finding it almost impossible to find data for the .41, using 2400 & cast bullets. Lyman 49, Speer 13 & Lee's Modern Reloading 2 have zero data for 2400, pushing a 21/215/220 hard cast.
The "One Book/One Caliber" for the .41 has data for Lyman's 212, 215 & 220 bullets, but.... I'm using...