Full credit for Hemingway #9 & #10

1/2 credit on #13 wink
The 4 B's are "Gus" Becker, John M. Browning, A.P. Bigelow, and Matthew S. Browning. Becker is holding a Winchester Model of 1887 lever action shotgun and the Brownings Winchester 1893 Repeating Shotguns. I've not been able to confirm Bigelow's double.
The photo was possibly taken at the 37th annual tournament of the New York State Association for the Protection of Fish and Game June 1895 at Saratoga Springs, N. Y., but the 4 shot together regularly in the West
https://digital.la84.org/digital/collection/p17103coll17/id/47929 lists the guns and loads used by the Brownings

John Browning in the same shawl sweater