I wrote an article about a year ago about one of these I had. It was cased like ashotgun and had its original H&H scope circa 1880 numbered to the rifle. The 'Royal was their best grade roof rifle , the 'Ross' was less well finished. I think most were built by Ellis in Birmingham, though other suppliers were used.
Min had been lines (Parker-rifled)to .22 rimfire and was a grat rabbit rifle - I shot quite afew with it before I sold it to an Irishman for £3,500.
Converted examples in .410 are worth alot less than either original calibre ones or those properly converted to a more modern calibre like .22 R/F or .22 hornet etc.
Prices of all of them have climbesd steadily over teh last 10 years. As shotgun they don't work unless the barrel has been turned down - the octagonal barrel is far too heavy for effective use asa bird gun and most conversions took no pains to see if the shot barrel patterned or shot to piont of aim at all. Most have no choke. Maybe OK for rat shooting at close range.
