RE: T/C Scout Rate of twist ?
No ,I haven't seen a PA flinter. As for the half round half octagon I do recall that. If I recall right they were rifle models of the Scouts with I think 24" or maybe 26" barrels.
My guns are full octagon and the carbine barrel length.
I keep coming across models that I have never seen before and when I contact T/C they aren't much help. I still haven't found anyone at T/C or other wise that can provide info on the Cody Scout model. I do know that they were made in both 50cal. and 54cal. as I've seen both. I've only seen the Texas in 50cal.
The fire at the factory has made things tough.
As for the twist rate it looks like the early guns were 1:20 54cal. and 1:38 50cal. and then maybe they went to 1:48.