[The undersigned assumes no liability expressed or implied for the use of the following data in guns other than his own. Usual disclaimer.]
I shoot .44-40 for CAS in both my OM Vaqueros, my Navy Arms (Uberti) M1860 Henry, and mostly in a Rossi M65 (M92 replica) rifles. I shoot 213.5 gr hard-cast commercially bullets .430" dia., with 8.0 gr Hodgdons Universal in Winchester brass, with Winchester Large Rifle primers. This loading is slightly in excess of the maximum listed in the Hodgdon Cowboy loads, but I have fired over 3,000 rounds in the Henry with NO increase in headspace nor any signs of problems. Case life is unknown because I have reloaded the same cases over 20 times, and the only ones lost were in the tall grass, or occasionally being torn by the sharp corner on the extractor cut in the barrel of the Rossi before I stoned the edge. The loads might be more than good for a Colt's or replicas over the long haul, but I have no data on this. Some folks would probably prefer lighter loads for recoil or noise reduction.
Ride careful, Pards!