"Hunting with the Twenty-Two", C.S. Landis
"The Big Game Rifle", Jack O'Conner
"Sheep and Sheep Hunting", Jack O'Conner
"Ends of the Earth", Roy Chapman Andrews
"East of the Sun and West of the Moon", Theodore and Kermit Roosevelt
Not really gun related, but very entertaining, "Dragon Hunter, Roy Chapman Andrews and the Central Asiatic Expeditions", Charles Gallenkamp