What is the caliber stamped on the barrel? The 99 was chambered in 25-35 Winchester early on but the action was strong enough to handle much heavier rounds in the 308 family. The 25-20 is a smaller cartridge than the 25-35 and would be dangerous. It might be possible to form cases from 30-30 brass but I am not positive. Midway carries 25-35 but it is pricey. You would have to get enough to reload and roll your own.
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"I would not be an old man if I had not been an armed young man." JTJ
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Last edited by JTJ; 01-15-2013 at 06:13 PM.