a friend of mine picked up a mod.29 silhouette (10-5/8 bbl.),just the gun no instruction manual. so can anyone tell me how is the front sight suppose to work, I understand that you turn the wheel to adjust the sight for fixed distances but is there a certain load or sight range you have to use to achieve this? do you sight in at say 50yds. and every dedent of the wheel moves impact up an x amount of yds. and do you have to use a special bullet weight and velocity to achieve this?