I shoot a Chiappa Sharps Carbine in 50/70 and my pet load is 29 grains of H4198 and a 450 grain round nosed bullet .515” in diameter.
Load gives me about 1250 FPS and is fairly accurate.
5 shots offhand at 100 yards.
This data is safe in my gun, like always you need to start low work up to a safe load for your rifle.
Dr.