I wouldn't do it. The rotary magazine 99s are troublesome to switch from 300 Sav to 308. The magazine rotor cutouts are the same shape and size as the cartridges themselves, and some 99s are tighter than others. A 308 Winchester is about 1/8" lonfer than a 300 Savage cartridge, so there may be issues. In addition, the 300 Sav operates at 48,000 psi, the 308 Win operates at 60,000 psi. This is the reason Savage strengthened and lengtheded the Sav 99 receiver design in the mid 1950s when they started offering the rifle in 308.
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