If you use bolts. When at your range drop the bolt & adjustment caps then clamp in a gun vise, range rest or on some sand bags, look down the bore at a target 25 or 100 yards (at 100 yards we put an orange stick on dot in the bull-just makes it easier to see), centre the bore on the dot, then simply adjust the scope to same object..finto. You'll still require the fine tuning shots but no different than a bore sighting device.

If you really want a bore sighter or will be sighting in pumps, autos or sealed breech ML take a look at the Bushnell Professional(or banner) Series Bore Sighter it has the adjustable arbours to ensure a snug fit. Comes with 3 arbours up to 45 cal and a 50 cal/shotgun arbour can also be purchased.