The Sightmark one I bought was very accurate(url above). When I was shopping I stayed away from the one's on Amazon that were blatantly from a Chinese seller.
Redthies wrote:I bought a relatively cheap bullet casing style one that you drop into the chamber. I didn’t find it to be very accurate. I’ve found bore sighting to be more of a waste of time and energy than not. I’m sure it has to do with which tool and which operator though. If you start your sighting in from scratch (without bore sight) at 25 yds, then move to 50 and then 100, you should be able to be on paper and dialing in the 100 yard zero after maybe a half dozen shots at 25 and 50.
