Richard,

What about the Howdah pistols?

Are you referring to the antique Howdah pistols, or the Jurras Howdah pistols? The older Howdahs were loaded with black powder ammo. Lee Jurras made the .500 Jurras and only one (1) .577 Jurras; never anything like the Nitro Express rounds. I have fired all but the .577 Jurras, most of the big bore SSK calibers (including the very rare .588 JDJ) and found them to be relatively comparable to the .50-140 Sharps. I haven't fired the .600 Nitro yet.

Bob