So you're asking us to give you a blessing to do something illegal? Well you're not going to get it here. The greater majority of members on this forum are ethical hunters that would not intentionally break a game law. I myself am a Hunter-Trapper Educational instructor and rules, regulations and ethics are some of the things we teach in our classes.
But there is nothing wrong with putting a set of sights on your fowler piece and see how it shoots. And if its accurate enough for deer then by all means use it where it is legal to do so.