I was cleaning up some stuff in the "old" loading room last night and found volume one of the speer loading manual (1954), among various other old loading manuals and notes and quite a few boxes of old reloaded rifle ammo. It was just kinda neat looking through some of the old data and results noted by my dad and his buddies when they were reloading. FWIW

Does that book have a load for 44 mag 240 gr 2400?

"Speer 1" 1954 ????????????????????????????????????????????
"Speer 3" 1959 44mag 240 gr JSP--------23.0 gr 2400 1564 fps
"Speer 6" 1964 44mag 240 gr JSP--------23.0 gr 2400 1564 fps
"Speer 7" 1966 44mag 240 gr JSP--------23.0 gr 2400 1564 fps
"Speer 8" 1970 44mag 240 gr JSP--------24.0 gr 2400 1574 fps
"Speer 9" 1974 44mag 240 gr JSP--------19.5 gr 2400 1344 fps
"Speer 10" 1979 44mag 240 gr JSP&MSP 22.2 gr 2400 1392 fps.
"Speer 11" 1987 44mag 240 gr JSP&MSP 22.2 gr 2400 1452 fps
"Speer 12" 1994 44mag 240 gr JSP&MSP 17.7 gr 2400 1271 fps
"Speer 13" 1998 44mag 240 gr JSP&MSP 21.0 gr 2400 1434 fps

The .44 Magnum was introduced in 1956, so probably a 1957 vintage manual will be the first to have loading data. Some might have put out an update for the .44, but I don't think so.