Are these things worth the trouble? I can see the benefit, but since a real round drops slightly it seems like they would only be good for close range...
http://www.laserbullet.com.au/what_is.html
http://www.laserbullet.com.au/what_is.html
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Sounds like a fancy way of boresighting. With a bolt action gun, I'd just pull out the bolt, look down the bore and go from there.
With an action that you can't do that with, I'd say that other boresighting methods are much cheaper.
In any event, once you get it close, I'd say you're still going to have to fine-tune it with live ammo and a screwdriver.....