WB
At normal pressures 180-200 gr. run 1000-1100 fps
Tuesday, August 04, 2020, 16:34

from a 4.5" barrel semi-auto. That is a slick cast bullet. They usually run about 100 fps faster than a jacketed bullet at the same pressures. Factory loads are 900-1000 fps for the same jacketed ammo.

I think the old Cowboy .38-40 load was a classic 180 gr. FN at 1000 fps from a Colt SAA or New Service? My rifles ran about 1200 or so with the same spec. loads.