Possibly this one
October 19, 1912
Sporting Life
https://digital.la84.org/digital/col...oll17/id/25615
Jack Fanning, the famous little professional of the du Pont Company, has been flinching so badly in the past two years that his usually good average has suffered. He is having a new gun built now that will incorporate some of his own ideas and he hopes to overcome the flinching.
It didn't work and he retired from competition
He did know something about gun fitting
Jack Fanning, the A.P. Curtis try gun, gun fitting and shooting style
Recreation, December 1914, “Your Shotgun Affinity”
https://books.google.com/books?id=DY...=RA1-PA323&lpg
https://books.google.com/books?id=DY...=RA1-PA347&lpg
Ken: I've been looking but can't ID the other shooters.