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Bore-sighting your rifle

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2004 at 12:50
Stephanie View Drop Down
TEAM SWFA - Staff
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Optics Goddess

Joined: February/13/2004
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FOR THOSE WHO DO NOT HAVE A BORE-SIGHTER:
Mount your scope on your rifle and tighten all screws. Set the target at 25 yards. From bench rest, aim at the center of your target and shoot about 3 rounds. Examine your target, check how far your Point of Impact is from. If the bullet hits were more than 3 inches (12 inches/100 yards) apart from where you aimed at, you have problem or problems are with your mounting system. Do not use windage and elevation adjustment screw. Adjust the mounting system first.
FOR THOSE WHO ARE USING A
BORE-SIGHTER:
With the top portion of your mounting rings open, put your riflescope on your rings, determine how far the center of your crosshairs is from the center of your bore-sighter grid. If they are more than 3 squares (12 inches/100 yards) apart from each other, you have problem(s) with your mounting system. Do not use windage and elevation adjustment screw. Adjust the mounting system first.
NOTE: Never force the windage and elevation screws past their natural stop. Internal damage can result rendering the scope inoperative. The most common occurrence with "over-adjusting" includes: power change system jamming, broken inner lenses, poor image quality, insufficient grouping of shots, and limited or irregular movement of POI alignment.
AFTER YOU HAVE BORE SIGHTED AND IT IS CLOSE:
Locate a safe place to test fire and fine tune your weapon, preferable a firing range. The next step is to find a stable place to fire from. If you cannot hold the weapon still, it will not zero in correctly. A couple of small sand bags will come in handy for stabilizing the weapon. A dry patch should be run through the bore to remove any oil. With a target set up at 100 yards you are now ready to test fire. Holding the crosshairs steady on the target, squeeze off a round. Repeat this two more times to get a three shot group. Retrieve your target and triangulate the shots to get an average point of impact. Measure from that (POI) to the bulls eye where you aimed. This measurement can now be adjusted out with adjusting screws located under the top and side screw off caps located in the center of the scope. The arrows on the dial show which direction they will move the bullet. Turn the adjusting screws according to the MOA scale on the dial. If they say 1/4 MOA, that's means one click will move the bullet 1/4" at 100 yards. Note, if you zero at a different yardage, say 50 Yards, one click will move the bullet only 1/8" at 50 yards. Once you have adjusted the windage (side screw) and the elevation (top screw), you are now ready for another 3 shot group. Repeat this process until you are satisfied with the results. It is important to allow the barrel to cool down in between the three shot groups as heating of the barrel can cause bullet flight to vary. It is also recommended to swab the bore between shots with a dry patch to reduce buildup. Do not use any cleaning fluid or oil on the swab as this can affect bullet flight. If you are sighting in the weapon for hunting deer, you may want to adjust the elevation an inch or two above bullseye at 100 yards. This will give your weapon extended range and still keep you in the kill zone at 100 yards and less. Sighting in should be done on a windless day or a least on a day when the wind is 5mph or less. When it is time to go shooting, make sure to run a dry patch through the bore to remove the protecting oil that was used after the last cleaning.

 

  Sight through the bore at a target of 100 yards. Move the rifle about to center the target in the bore

 

 Sight through the scope and adjust the windage and elevation screws to center the target on the reticle.

 

For those who may not know!!!!





Edited by Stephanie
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/02/2004 at 00:58
ConradCA View Drop Down
Optics GrassHopper
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I use a rifle rest while sighting in my scopes. It does a good job of holding the rifle still while I sight it in.

 

Here is the proceedure that I use:

 

1) Make point of aim == point of impact at 25 yards

    use the highest magnification

    pick an aiming point on the target that I can remember.

    fire one round

    hold rifle so crosshairs on point of aim

    adjust the windage and elevation so the the crosshairs are on the point of impact.

    fire a round to verify point of aim == point of impact

    repeat proceedure until point of aim == point of impact

 

2) Make point of aim == point of impact at 100 yards

    use the highest magnification

    pick an aiming point on the target that I can remember.

    fire one round

    hold rifle so crosshairs on point of aim

    adjust the windage and elevation so the the crosshairs are on the point of impact.

    fire a round to verify point of aim == point of impact

    repeat proceedure until point of aim == point of impact

 

3) Check group of 3 or 5 shoots

    shoot 3-5 shoots at same point of aim

    measure goup

    check for acceptable accuracy

 

4) Varmint scope

    use turrets to adjust POI

    I should be dead on at 100 yards

    Use computer program to calculated POI at 100 yards for dead on at 200, 300, 400, 500 yards

    Adjust elevation to be dead on at each yardage and check elevation at 100 yards.

 

5) Big Game

    Use the max point blank range method

    Determine POI at 100 yards

    adjust elevation so bullets hit at 100 yards as specified to maximise point blank range.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2004 at 15:27
Boomholzer View Drop Down
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How about insuring correct scope position in the rings without a bore sighter?

Any tricks to get the scope positioned so the recticles are perfectly verticle/horizontal? 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2004 at 16:20
Roy Finn View Drop Down
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The Segway Reticle Leveler works pretty well.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/04/2004 at 23:33
Dale Clifford View Drop Down
Optics Jedi Knight
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Joined: July/04/2004
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A down and dirty trick for any rifle, even AR and oddies like a CETME is as follows. Set the rifle on something solid, like the back of a sofa. Stick a 1 inch or smaller red dot on the wall opposite. Look down the bore and center it on the dot, Carefully look through the scope  and adjust the recticle settings.

For horizontal position and last tighting (usually this is done before the bore sighting) hold the rifle on the sofa and like up the horizontal with a window sill. Now back your eye ball away untill the scope opening, the light coming thru and the black shadow form concentric circles. YOu should see a small part of the cross hair and the off set will be immediately apparent.

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