In 1860 49 out 0of 122 gunsmiths listed as such in the Michigan census were from New York. Likewise NY contributed the most in general to the MI population.
Claudius Beach, born about 1815 in East Bloomfield, NY, left for Marshal, Michigan about 1844. Beach died in MI Aug 26, 1888.
This O/U deeply rifled .45 Beach returned to MI from S. Dakota was likely used on heavy Western game.
All from the book Michigan Gunsmiths, copyright 2013, by James Kelly and Dorr N. Wiltse, Jr.
Dorr has been studying Michigan guns for maybe 70 years now, I for only 20. None of the other Michigan "experts" ever bothered to write anything and/or their notes have been lost to second wives. So guys, Wiltse and Kelly are what ya got.