Ha ha. My actual main point was the above.

Their rules also preclude muzzle loaders. Mine does not! If it is a double barrelled Howdah pistol. As only two shots are fired.

So what cartridges would be suitable for the above?

What existing hand gun cartridges would fulfill these needs?

What shotgun cartridges loaded with slug or ball would satisfy these minimums?

I will do some searching, but suggestions with calibre, bullet weight and energy levels should be included. And also if possible recoil energy and velocity. In a suitable weight firearm a howdah would be.

Can anyone supply the weight of a typical howdah pistol?

Lets have a look? Not all of these might be adequate for the criteria.

The .577 howdah cartridges? I am not knowledgeable on these?

.45/70
.45 Long Colt
20-bore shotgun
16-bore shotgun
12-bore shotgun
28-bore shotgun?

Just for comparison, .367 Magnum

Others?
.454 Casull, Ripps new bear handgun?