First chamber-cast, can't figure the chambering

[Skamnakias]

Hoping that someone with a lot more knowledge on Rolling Blocks can help me with this question.
Have a mystery Danish/Greek? Rolling Block and finally got around to chamber-casting (my first) with Cerrosafe.
After the obligatory one-hour cooling period I took the following measurements and I'm no closer than I was before in determining the round it's chambered for...
Fair-warning, it's my first time and some measurements way be slightly off primarily the total length one. Pic attached, all measurements in inches and thanks in advance for your assistance.

[Mainspring]

I'm drawing a blank on those dims. I may have a couple books that will help if I can locate them. If the gun can be identified that will help. If the barrel has been changed or set back then it's a possibility that the cartridge is a wildcat.

The chamber cast looks pretty good. A little less warming of the chamber area prior to casting should eliminate the frosted look. Too cold and wrinkles will show.

I think the dims attributed to the Lands and Grooves are reversed, no big deal in this circumstance. The cast gives a reversed image.

[Skamnakias]

Thank you Mainspring, appreciate your comments. You are correct, the dimensions for lands and grooves are reversed, thanks for pointing that out.
The rifle I have is a mishmash of parts, I think I will post some pics of it and solicit some help identifying it.

[marlinman93]

With the exception of length it matches closely to 11.43 Egyptian, but length is closer to .43 Spanish Reformado. I wonder if it started life as the Egyptian and someone ran a .44-77 BN reamer in to open up the length?