I have a shallow Vee rear sight on my J-frame, 317-3 with a 3 inch barrel with a fiber optic front sight. Now on paper the shallow v sounds like a good idea. The fiber optic front is a winner, but the shallow V sucks rocks . It is very hard to shoot accurately. Just hitting cans at 25 feet is hard and I'm a decent shot. Before you go to the expense try shooting one and see if you like it.
I'm replacing mine with anything but a shallow vee.
Gary