This is probably old stuff to most here but some might find this helpful. This proceedure requires that you first remove the bolt. With that done this is how I bore sight a rifle. I clamp the rifle in my work-mate using a towel as a soft jaw. Looking through the bore I acquire a sight picture of a target, I use my neighbors mail box which is about 125 yards from my shop. For a more precise setting I sometimes use a a cartridge case that was fired in the chamber with the primer pocket drilled out to 1/8 inch. With the bore sighted on the target I then align the sights/scope up to the same target. That's it, now its ready to be zeroed in. Hope this helps some one save some time and powder getting it on the paper.
Merry Christmas Everyone