Walt: "Uncle Bob" did probably make some Twist barrels long before he was at Ithaca
The June, 1909
Outer's Book, A Magazine of Outdoor Interest had an article about Uncle Bob which stated that from 1861-1865 he worked in Brookton, an Ithaca N.Y. suburb, where there was a barrel factory making steel barrels for the U.S. Government, and iron and stub twist barrels for the local gunsmiths and gunmakers of the period. The stub twist barrels were made of horseshoe nails brought in by the country's blacksmiths. ...to the best of his knowledge today he was the only man in the United States working at barrel boring who ever made twist and damascus barrels.
We also know that John Blaze made Crolle barrels for Dan Wesson, then Laminated Steel for Parker Bros.
(Horace) Smith & Wesson and Daniel B. Wesson

More information here
https://docs.google.com/document/d/12y9006Ur7mMCqdeeye89c7L4DQrc2iXR8p4S6OIN1bA/edit