From what I have read in "The Archer's Bible" (by Fred), and an odd article or two he wrote, he stated he used a 75# recurve and a single arrow to take that Bull Elephant. Not sure of bow length, but I'm guessing 60", based on info below from Lattimer's book.
In the American Sportsman "Canadian Grizzly Hunt",(mid 1960's) he used a 70# recurve, That is what he told Fess Parker.
Aside from the above two bows, most of the time, it appears he uses a 65# recurve of current production. In the older films, Static recurves, and working recurves later on. He was not only hunting, but demonstrating and advertising his bows. 65# was the weight he used most often, even for small game, and he wrote in later years that he liked the 60" length.
Those old static recurves were the coolest looking bows!
In Dick Lattimer's book, "I Remember Papa Bear" there are quotes from Fred on his equipment in chapter 4, and he said he liked the 60" 65# recurve, and that he used the 60" length for over 30 years. It's a great book and I'm reading it now for the 3rd time in a year.