Define accurate - given that different loads shoot to different points of aim.
Define accurate - given that different loads shoot to different points of aim I wouldn't expect the laser bore sight to match any particular load perfectly. Then too firearms especially pistols - depending on range - will shoot above their bore line as the pistol rises in recoil before the bullet leaves the barrel - one more reason to follow through.
That said laser bore sighters are certainly good enough for government work - and so used.
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