Simple calculation.
562” round ball=240 grains. ( same weigth as a 44 mag standard bullet).
The chamber measures 14 mm diameter x 27 mm long= 27x3,1416x 49 =41 cubic centimeters = 58 grains 3F powder maximum charge,
In short, 240 grain bullet X 58 grains charge.
By comparison, a Colt Walker
141 grains bulletX 55/58 grains maximum charge.
Calculations based on 240 grains/141 grains= 1,7 times more mass in the 562 round ball than in the 454 ball, so this revolver migth well almost double the Colt Walker in muzzle energy.
This revolver is based on the Adams Beaumont design, which was vey sucessful and efective. There are several units of them in collections and museums in Europe, so it was industrially manufactured and relative sucessful, but not in the USA so it was virtually unknown to US gun writers, thought well documented in Europe.
Lets not forget the original british Adams Beaumont Dragoon revolvers, the large frame configurations, shooting a 540 “ caliber bullet of 227 grainsX60 grains of powder....quite more powerful, around 60%, than the Colt Walker,
So Myth busted, no, the Colt Walker was not the most powerful Revolver, as both British and Austrian large caliber industrial revolvers were quite more powerful.