Ah, this is how it starts. I'd suggest ordering a copy of Murray's book on 99's, it has all of these answers. You can find ordering information in the "Misc. Good Info" thread at the top of the forum.
Basically, all three are rotary mag. Now, going from memory..
99EG mostly had 24" barrel, but a couple calibers had shorter lengths in some years. Made from 1935 throught 1959.
99R also mostly had a 24" barrel. The forearm was always rounded, but had a major change in the 40's. Made from.. 1935 through 1959.
99F, the LATER version, had a rounded forearm and was a featherweight. Thin barrel and holes bored in the buttstock make this the lightest of the late 99's. 22" barrel, made from 1955 throught 1959. Well, made later than 1959 but the 1955 to 1959 are the desirable ones.
The 300 Savage cartridge is a light-weight 308.. most sources say the 308 was designed from the 300 Savage. Both are good hunting cartridges, the 308 will reach a bit farther but kicks quite a bit more.
