The most common 99 Savage made falls right into that serial range. It's going to be either a model R or and I have a strong feeling the gun your talking about is a Savage model 99EG in 300 Savage caliber, they were kinda like the Winchester 94's in 30-30, everyone had one.
An EG will have a Schnabel tipped forearm and the R will have a rounder semi beaver tailed forearm.
Made (without checking) somewhere around late 1948.
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