Grant,
After 1948, I doubt that Fred used the Snake Skin Back Deerslayer for much besides showing it off, demos, etc. I know of no hunting photographs of him with a Deerslayer after 1948.
In 1949 he used the Static Grizzly.
During the 1950-1953 era he used the Static Kodiak and in 1953 he took the world record bow kill Elk in Wyoming with a static Kodiak, photographs prove that fact.
In 1954-56 he used double shelf Kodiaks to take several animals, photographs prove that fact.
In 1957 he used a single shelf 1957 Kodiak.
In 1958 he was still using the single shelf 1957 Kodiak.
From 1959 on you probably know what he was shooting.
Fred also took more than one bow with him on more than one trip.
Sam - Hey, I see static bow tips like that all the time. They are all over the place around here... Seriously, Grant's account is correct. Simply put working recurves limbs are more efficient than static recurves.
Hopefully some of our talented traditional bowyers will bring back some of the true classic bow designs like the Grumley Deerslayer and Bush Bow.