re: identifying guns used. From c. 1895 - about 1902 most of the U.S. sporting magazines included the guns, powder and shells used by competitors. Thereafter, figuring out the guns used depends on finding advertisements connecting the shooter with the gun

Walter Ewing (individual Gold) and George Beattie (individual Silver) at the 1908 Olympic Games

[Linked Image from photos.smugmug.com]

Ewing's gun then confirmed with an ad

[Linked Image from photos.smugmug.com]