Question for the group: I am planning to build an American Fowler with British styling cues. Many, if not most of the originals have a rear sighting groove filed into the breech, often into a raised area at the front of the breech plug. I realize that this would not qualify for use in smoothbore competition, so my question is, what percentage of smoothbore shooters are competing, and, would it damper the saleability of such a piece if it were to incorporate such a sighting groove?