Any HINT of what that barrel was originally hung off of ?

Fastest twist for an original .44 Henry RF would be a 1 in 26",.....and as the entire planet adapted that generic, very popular cartridge into it's CF iterations, the rifling twist rates didn't get a whole lot faster.

The 14" TPI callout is intriguing, to say the least.

GTC

Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain