Savage introduced the .308 Winchester cartridge in their Model 99s in 1954/1955
in the Models 99R, 99RS and the 99 EG.
The following year (1956), Savage added the .243 and the .358 Winchester (both cartridges use a .308 case with the neck resized to the caliber in question) in the Models 99R, 99RS, 99EG and, finally to the 99F (1959). savage 99 actions - 24hourcampfire http://thefiringline.com/forums/show....php?p=4868728
on page 8 of the 1960 July issue of Guns magazine, in Elmer Keith Says column, He relates how the one millionth Savage 99 had both tang and lever safetys the rotary mag and the new Monte Carlo comb butt stock