I think I need to emphasize a little bit more than I did on that long comment I made that it isn't necessary to "boresight" since zeroing scopes has been done more without a boresighter than with one. Boresighting is merely judged easier by some shooters, but not all. Try to zero with the "look through the barrel" method I wrote about since boresighting is not more accurate than a properly zeroed scope without a boresighter and can be done with no more than several shots, sometimes 3 or 4 shots to bullseye with 2 sandbags