Couldn't find any .38-55 gallery loads in Waters' book but the Hogdon powder catalog/reloading manual I have shows two low velocity loads for the .38-55 under "long range rifle match," a "Cowboy Action Shooting" event"

250 grain cast bullet, 6 gr. Trail Boss @842 fps

250 grain cast bullet, 7 gr. Trail Boss @911 fps

Those should be quite quiet, and have low penetration.

Was Mike Armstrong. Got logged off; couldn't log back on. RE-registered my old call sign, Mesa.
FNG. Again.
Mike Armstrong