The earlier 1950s Lyman reloading manuals provided recipes for .38-44 factory duplication loads as 12.0 to 12.5 grains of 2400 and a 158 grain lead bullet. Seems to me to be a formula for quick bore leading, but I guess it worked. I did some research using an internal ballistics computer program awhile back, and found that 2400 is the ideal canister propellant to use for .38-44 level reloads to achieve maximum velocity at minimum chamber pressure.