Not sure about safes specifically made for scoped rifles, but when it come to safes in general, take the number of guns it says it holds and cut it in half. Seriously, gunsafe capacity claims by most, if not all, manufacturers is borderline immoral, haha. If you need to store 12 rifles, get a 24 gun safe. You'll also find yourself wanting to put more than just guns in there, so bigger is better.