Is the Volcanic Pistol Really That Lethal?

Hey everyone, I've been doing some research on early firearms, and the Volcanic Repeating Arms pistol keeps coming up. I'm curious about its actual effectiveness in a real-world combat scenario. Was it truly considered a lethal weapon for its time, especially compared to contemporary single-shot pistols or revolvers? I've read about its unique lever-action mechanism and rocket ball ammunition, but there seems to be mixed opinions on its stopping power. What are your thoughts or any historical insights you might have on the Volcanic pistol's lethality?