I recently replaced the scope on one of my rifles and in effort to avoid having to waste alot of ammo sending sighter rounds down range, I bought one of those cheap laser bore sighters off of the flea-bay auction sight.
It's the kind that comes with various expandable rubber arbors so as to allow the bore sighter to fit any bore from .22-.50 caliber.
http://www.ebay.com/itm/Red-Laser-Bo...QAAMXQVT9SxNd0
The concept behind the design is a sound one and the laser itself works quite well but the poor tolerance/fit of the rubber arbors makes adjusting the actual laser light to dead center virtually impossible. On my specimen the correct rubber arbor slid down the bore well enough but the laser did not align with the center of the bore of my rifle. The sparse instruction stated that this laser was adjusted at that factory and cautioned against any further adjustments. Kind of humorous if your not the guy who just shelled out the money to buy one.
With the laser bore sighter in place and held approximately 36" from a wall or vertical surface that will reflect that laser light, I could carefully spin that laser light and clearly see that it traced a 2 1/2" circle on the wall. That was at 36" away from the wall. Now imagine trying to center my crosshairs on that laser dot at 25 yards. I'd need a backstop the size of a large bill board just to be able to find that laser dot. That 2 1/2" traced circle I got at 36" would be multiplied enough times so that the laser light wouldn't even find its way onto an average sized bullseye target; even at ten yards.
On a positive note: I'm a chronic tinkerer so I was able to fabricate some tighter tolerance brass arbors and re-adjust the laser light to dead center out to fifty yards. Hopefully that will keep me form wasting alot of bullets just to get my shots on paper when I'm trying to zero my scope.
HollowPoint