I use use 2-7X, 3-9X and 1-4X scopes. Never shot a head of game yet on anything but the lowest magnification. I figure each X is good for at least 100-150 yards for big game. You'll need more magnification for varmints, but 3X should be useable on big game out to at least 300 yards.
It wouldn't be something I'd go out and buy for that rifle. But you already have it, use it. If you decide you want more you can upgrade later. After using it for a while you may decide it is all you need.