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Boresighting

 
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  #1  
Old 12-22-2013, 11:07 AM
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Boresighting

I have attempted to boresight 2 scopes on 2 different guns with 2 different laser boresighters. Both scopes run out of movement before either will come up enough to center on the reticle. I have tried both scopes on both guns with the same result. One boresighter is a LaserLyte that goes in the muzzle and the other is an AimShot that goes in the chamber. Can some one please give me some input what the problem may be?
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Old 12-22-2013, 11:30 AM
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How far from the muzzle was the target that you're sighting with the the laser and scope?
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Old 12-22-2013, 02:22 PM
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Re: Boresighting

I tried it at 25 ft. to 75ft.
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Old 12-22-2013, 08:34 PM
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Sighting in a scope at such short distances is always inaccurate. You could easily have a problem zeroing this way at 25 ft, where the laser is too low by about 19 MOA. At 75 ft the laser is too low by about 5 MOA. That's assuming you ultimately want a 100 yd zero.

The Laserlyte boresighter has molded plastic arbors that flex when inserted into the bore, allowing the laser to shift as much as 10 MOA from boresight. If the plastic arbor is damaged, the error could be as much as 20 MOA. Try rotating inserting the boresighter rotated 180 degrees. Does the laser spot move a lot? The cartridge type lasers are not much better. When using them it's a good idea to see if the laser is exiting he muzzle in the center of the bore.

So, you could have ~15 MOA of bore sight error combined with 5 MOA due sighting at 75 ft. If the barrel is installed crooked by even 10 MOA (quite common) in the wrong direction, the scope may not have enough adjustment range.

I recommend that you check your laser tools to make sure they are accurately indicating the bore axis. Then sight a point about 5 MOA (1.75 inch) higher than the laser spot when sighting at 75 ft.
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Old 12-22-2013, 09:09 PM
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Re: Boresighting

Are your rifles bolt actions? If they are,

Just for the heck of it, take the bolt out and hang a shiny pie plate or something up a 100 yards out, now that the bolt is out glance down through the barrel from the back of course, and see if you can see your shinny target.
If you can then get something to stabilize the rifle a little be it sand bags or a gun vise in order to hold your gun solid then try to look through and get the shiny target centered in your view again looking through the barrel. Once centered have another person adjust the turrets until the cross hairs are on your shinny target. Glance back and forth to see if both look spot on. If this is the case you will end up within inches of a perfect shot at 100 yards (if thatís where you hung your shinny target)
After a while you will be able to do this real fast aiming at a sign, pine branch, target face whatever that you have out about 100 yards to get your scope close for sighting in at 100 for zero.
No gadgets and fast plus itís just better knowing you did it yourself.

Cheers
oneshot.onehit
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Old 12-22-2013, 10:08 PM
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Re: Boresighting

Quote:
Originally Posted by osoh View Post
Are your rifles bolt actions? If they are,

Just for the heck of it, take the bolt out and hang a shiny pie plate or something up a 100 yards out, now that the bolt is out glance down through the barrel from the back of course, and see if you can see your shinny target.
If you can then get something to stabilize the rifle a little be it sand bags or a gun vise in order to hold your gun solid then try to look through and get the shiny target centered in your view again looking through the barrel. Once centered have another person adjust the turrets until the cross hairs are on your shinny target. Glance back and forth to see if both look spot on. If this is the case you will end up within inches of a perfect shot at 100 yards (if thatís where you hung your shinny target)
After a while you will be able to do this real fast aiming at a sign, pine branch, target face whatever that you have out about 100 yards to get your scope close for sighting in at 100 for zero.
No gadgets and fast plus itís just better knowing you did it yourself.

Cheers
oneshot.onehit
+1

I use a 6 or 8'' black bulls eye pistol target the same way .

I am normally within 3 or 4 inches the first shot. and by aiming the scope at the same aim point and without moving the rifle , I move the cross hairs to the first bullet hole and I am on. (Two Shots).

J E CUSTOM
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Old 12-22-2013, 10:45 PM
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Quote:
Originally Posted by osoh View Post
Are your rifles bolt actions? If they are, Just for the heck of it, take the bolt out and hang a shiny pie plate or something up a 100 yards out, now that the bolt is out glance down through the barrel from the back of course, and see if you can see your shinny target. If you can then get something to stabilize the rifle a little be it sand bags or a gun vise in order to hold your gun solid then try to look through and get the shiny target centered in your view again looking through the barrel. Once centered have another person adjust the turrets until the cross hairs are on your shinny target. Glance back and forth to see if both look spot on. If this is the case you will end up within inches of a perfect shot at 100 yards (if that’s where you hung your shinny target) After a while you will be able to do this real fast aiming at a sign, pine branch, target face whatever that you have out about 100 yards to get your scope close for sighting in at 100 for zero. No gadgets and fast plus it’s just better knowing you did it yourself. Cheers oneshot.onehit
I agree. I think laser boresighters are just a gimmick. Sighting down the barrel, if your rifle allows it, is actually just as convenient. The best use for a laser boresighter is to tease cats.

When I'm running scope clinics at the range, I use a boresight collimator for convenience, but it's no more accurate than the method described above. A boresight collimator has a dozen uses, other than zeroing sights.

Also be aware that barrel vibration can throw shots away from boresight. Aiming errors of 4-6" are common, but I've seen 10" or more, causing shots to miss paper at 100 yds. Barrel vibration is especially bad in lightweight factory barrels on magnum rifles. It's a good idea to fire your first shot at 50 yds to make sure it's on paper.
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