The example in my collection is chambered for the .22 Hi-power cartridge.
Surprisingly accurate for a take-down.
It has an interesting provenance: was purchased new in 1919/20 for an arctic exploration and supply ship, for the purpose of collecting seal meat for the sled-dogs.
Here's a short story I wrote for our local Arms Collectors journal a few years ago:

"Lever-gun with a History- Savage Model 99 .22 High-Power Take-down Carbine"

As Mr Towsley concurs in his article, vintage Savage 99s are marvelous things!