Don’t confuse big with powerful when it comes to the old British pistol calibres. I don’t have the ballistics to hand but it probably only bumbled along at about 600fps
Compared to modern pistols it was feeble
Real Howdah pistols (the term is often misused) were, as John says, cutdown double rifles used for one purpose only. To be mounted, usually in pairs, somewhere handy at the front of a Howdah to serve as the last line of defence when attacked by a tiger. Tigers it seem would climb up the elephant’s trunk to get to the humans.
The .577 Snider also inspired a number of civilian varients in the double rifle world so you have a basis for adding to your collection but the big game cartridges, usually but not exclusively Kynoch, are very expensive now.