Savage mags and bottom metal come in two types (besides long and short action). Metal and plastic. Savage makes a 9 useable rounds mag if you have the metal bottom metal. Dark Eagle makes 10 rounders as well. If you have the plastic clip on the magazine, you can call Savage and order the metal bottom metal and magazines. You can cut the plastic tab off the magazines, and they work in the metal bottom metal.
Check out the classifieds in the forum below. Lots of stuff for Savage. Also, check out www.savageshooters.com forum.