Laser boresighting 25yards

T

tpirovol

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Hey Everyone,

I have used my boresighter many times to sight in at 100yards. Does anyone have a target that can compensate for the delta in trajectory from 100 - 25 yards. I am sighting in a red dot and my eye are not as good as they use to be. Figured I would save some rounds by doing it this way.

http://www.cabelas.ca/product/39208/wheeler-professional-laser-boresighters

Also is the most common distance for sighting in a red dot on an AR 15 yards??

Thanks T
P.S. Going to bring a fellow CGN'er who volunteered to help me anyone else want to come out for a late night of shooting indoors let me know.
 
No. Sight height is crucial for one thing. It would be worth using a ballistics calculator to get a drop table for your ammo/sight. I wrote an Android app specifically for that.
 
Are you using the same optics or different?


A quick and cheap way to sight in your AR with new optics...

- Remove upper from lower
- Remove BCG from upper
- Lay the Upper on your benchrest or flat on the bench, upright and pointing towards the target
- With your dominant eye, sight through the back of the receiver down the bore of the barrel and center it on the target
- Without moving the receiver, move the red dot so that it covers the same point on the target as in the step above.
- Replace BCG and reassemble the rifle.
- Benchrest the rifle and fire a test round at the target
- Adjust red dot accordlingly
- Insert silly smile and keep on shooting
 
If you zero at 25yds, you should be pretty damn close at 300yds.
If you zero at 50yds, you should be pretty damn close at 200yds.

Aim at the bottom target on your paper and you'll be fine, about 3.25 inches high. (with typical 55gr factory ammo)
 
Trinimon said:
Are you using the same optics or different?


A quick and cheap way to sight in your AR with new optics...

- Remove upper from lower
- Remove BCG from upper
- Lay the Upper on your benchrest or flat on the bench, upright and pointing towards the target
- With your dominant eye, sight through the back of the receiver down the bore of the barrel and center it on the target
- Without moving the receiver, move the red dot so that it covers the same point on the target as in the step above.
- Replace BCG and reassemble the rifle.
- Benchrest the rifle and fire a test round at the target
- Adjust red dot accordlingly
- Insert silly smile and keep on shooting
Click to expand...

I like doing it that way for bolt actions too.
 
I laser boresight in my garage...

I take a rough measurement from the centre of the bore to the centre of the the scope - just using a tape measure from the open chamber to the center of the scop I get within a few millimetres.

Then I use a level to line up a piece of masking tape on the garage door, and draw a dark line down the centre of it with a sharpie. (actually, the same piece of tape has adorned my garage door for a few years now).

At the top of the sharpie line, I "T" it. Then I measure down the verticle line to 9/10ths of the distance I measured from the bore to the centre of the scope, and put a hash off to one side.

At ten yards from the door (30 feet), I set up the rifle with a laser boresight in a rifle rest. I put the crosshair on the top of the "T" and see where the bore laser is hitting relative to that. First I adjust for windage until the laser is striking the vertical line. Then adjust for elevation until the crosshair is on the intersection of the "T" and the laser is on the "9/10ths" hash.

What this will give me is an "on paper" sight at 100 yards. Usually within 4 or 5 inches of zeroed. It allows me to make all the gross adjustments in the comfort and warmth of my garage, and then I just have to fire maybe a half dozen shots at the range to dial it in all the way.

Cheers.
 
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