sighting in a scope using laser

Note that a barre's bore axis does not point directly at some place above the desired impact point equal to the bullet's drop from bore axis at that range when the round fires and the bullet does strike the desired impact point.

The bore axis moves a bit in different directions while the bullet's going down the barrel. How much it moves depends on how the rifle's held, where the recoil axis is relative to the butt plate's position on the shooter and how much recoil there is. Two people shooting the same rifle and ammo typically have different sight settings for a zero at a given range; it happens and is most noticed with scope sights.

So, a real accurate bore sight by any means just gets bullet impact close to point of aim, not perfect, so you gotta shoot the darned rifle and ammo to get it right.

Ever wonder why the front sight on handguns is higher above the bore axis than the rear sight? And double barrel elephant whompers' barrel axes cross 10 to 20 yards down range to zero at 40 or 50 yards.
 
A couple of years ago I purchased a bore sighter from Bass Pro Shops. Its a Red Head brand and it puts me on paper every time. Always 4-6 inches from dead center. 2-3 shots later I'm where I want to be. It doesn't matter what bore sighter you use, its gonna put you close but not close enough. You have to do the rest.
 
Sighting down the bore is the easiest.
Only boresighter I've found worth a damn is the Leupold boresighter.
It's also helpful when changing scopes. Note the zero position of the crosshairs on the graph (sometimes not at "zero"), install new scope, adjust windage/elevation to match zero from the other scope...gets us real close.
 
I have a laser bore sighter for my 223, its good to start at 25 yards then move out and actually shoot. the best thing I found is to use the laser bore sighter is when setting up my chronograph, i get the laser set then aim thru scope to my intended target, then drop a piece of card board on my chrono, just to be sure. I havent shot my Chrono yet !
 
Personally I like the laser bore sighters. They allow me to sight to "close" before ever firing a shot.

Example, I sighted in my new AR, only I forgot my bore sighter. I spent an hour trying to just FIND the paper with the bullet. The guy next to me let me borrow his bore sighter. Come to find out the scope was WAY off. Bore sighter allowed me to sight in to the paper and within 10 minutes I was zeroed in at 100 yrds.

The only draw back I've found is that most laser bore sighters are only good out to about 25yrds. I've used the Wheeler Professional Laser Bore Sighter once and that laser is MUCH stonger than any other one I've used. I can reach out A LOT further for sight in than with the smaller in chamber models.
 
I think that if you can look down the barrel like on a bolt gun or take off the upper on an AR and look down the barrel a laser bore sighter is not needed. I recently sighted in my AK and that was a pain because the sight was WAY off and I couldn't see down the barrel. If I have to do it again I will get the posterboard like someone else mentioned.

All the reviews of boresighters I have seen are 50/50. I would rather spend that boresighter money on ammo. Even if I am using more ammo like I did with my AK it was still enjoyable for me pulling that trigger. :)
 
" i saw a tool where you place it in the front on your gun barrel and the top part is a graph what is that tool called?"


The tool is called a collimator.

The interesting thing about laser boresighters or collimators is that they themselves need to be zeroed, or gotten very close, in order to work properly. That is why they have windage and elevation adjustments. Theoretically, if the collimator is properly zeroed (especially for the desired zero distance for the rifle)....then the laser can be used to dial in a scope, without firing a shot.

Unfortunately, however, such devices are seldom spot-on - and it is a bit of a hassle to get them set up. I know this by way of experience. So, at this point, I prefer to bore sight the good old fashioned way - by sighting through the barrel. Less hassle, actually - and since the purpose of boresighting is to get the rifle CLOSE (but not zeroed), so as to not waste ammo at the range....this method works well enough. Further, it costs nothing and can be quite precise. I've gotten my rifles adjusted, via the old-fashioned method, close enough that only around 1 inch or so of actual adjustment of the POI has been required, in order to zero the rifle. That is every bit as precise as any of the laser collimators on the market will allow - without a lot of tedious set up, anyway.
 
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