Sweep the opening isn't the most desirable. Nothing wrong with it, it's just slow and awkward. Look on the bottom of the rifle cases and it will tell you what caliber it is. The mold should also be marked. I wouldn't buy a drilling without knowing what the rifle caliber is unless it was really cheap. Without seeing the rifle we can't give you an estimate on worth. Just my opinion but I'd keep looking. For the money you wish to spend you can get a much better drilling.