regreatable, i have seen some games where the players want the boresight to be right no the money and will go to extreme lengths using odd math and strange tools to make sure it is a perfect line. The game players also have a chess style rule once you let go of the model you can't touch it again.. thus boresight becomes to much of a hassle to mess with...
players like that need to get a life. this isn't ACTA-CAD, this is a tabletop game. that standard of accuracy isn't possible, playable, and certainly not fun. I'm there to play, not put theory-to-practice on the quadratic equation, or the pythagorean theorem - and I'm an engineer!
Chernobyl