I just read two of the biographies of RCA and paid special attention to the photographs (with a magnifying glass). In a picture of him and his first wife on an early expedition in Asia, she is holding a full-stocked Mannlicher Schoenauer carbine (I assume it is his 6.5x54) and he is holding a very Germanic-looking hammer drilling--they have shot various medium- sized mammal specimens--jackals, giant hares, etc. There is also a later photo of him on horseback with an Asian antelope and a Savage 99, which I assume is a .250-3000, since he is known to have favored that ctg. There is also a later photo of him with a Savage Model 20 BA, probably also a .250. There's an early picture of him with a Fox double with a semi-pistol grip.
In his later life in the US he was an avid skeet, trap, waterfowl and upland shooter; there is only one photo of him with his second wife, each with a double--she has an English-stocked Fox and he has a long-barreled sidelock, perhaps an Elsie. Can't tell from the photo.
He seems to have had generally good judgement in firearms but was "true" to just one, the 6" Colt "Army Special" .38 Spl. that he carries in many of the expedition photos. Certainly a sidearm you could trust your life to! One of the photos shows cartridges in his belt with what look to me very much to me like the old 200 gr. "Super Police" bullets.
