even thou when i had mine done i was about 3 feet away from the paper after they boresighted it,,
Bore sighters and their grids are designed for the flat trajectory of a rifle bullet, not the rainbow shaped trajectory of a shotgun slug, and the grid is preset for 100 yards, so in many cases, it can have you further off target than on with a slug. Either way, as previously stated, a bore sighter is designed to get you on the paper, I have never bore sighted a rifle(which the bore sighter is designed for) that didn't require final adjusting or dialing in after being bore sighted.
I have found, on an average with slug guns if the scope is at the center of it's vertical and horizontal adjustment(which new scopes are supposed to be), the average slug, at 50 yards, will be 4 to 10 inches low, and slightly right or left, depending on how square the cantilever is mounted on the barrel, or the receiver is drilled & tapped. I generally take one carefully aimed shot, measure the distance from the bullseye, adjust the scope accordingly, then shoot groups of 3 for final adjustment. Remember, that if you sight in at 50 yards, your windage & elevation adjustments are half of what the specs say they are, as the specs are for 100 yards on scopes.
So no, you certainly don't need a bore sighter to sight it in. I do have a bore sighter and all the necessary spuds, and judging by your name (saltmarsh), you may be close to me, I'm in Brick, you'd be welcome to borrow mine if I am close to you, and it is convenient for you.
Garry
