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Thread: Want to try 100M zero, no 100M range...

  1. #11
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    There are targets here on M4C for a 100 meter Zero at 25 meters.

    I would get those and zero at 25 meters then move same target out to 75 yards. You should be able to get very close with that and the math from the other links. IOW, use target to verify math.

    Use some serach terms that contain these words.

    AIMPOINT 25 Yard Zero Target - For 100 Yard Zero

    I can't find the newer ones and this one doesn't have his name on it. I think the new ones are in meters and have his name. They have been posted several times.

    I can email you this target I have if you want.

  2. #12
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    Here is another option for external ballistic calculations. I use the introductory software. It is simple to use. I select a cartidge similar to the one I am firing and enter the actual muzzle velocity into the program. I set my chronograph at 15 feet from the muzzle to avoid muzzle blast from hitting the chrono.

    I have data on several .223 rounds I have tested in 16" and 20" barreled gas guns and a 26" bolt action rifle. If you want to provide barrel length and cartridge type, I might have data on file.

    http://www.remington.com/pages/news-...-software.aspx
    Train 2 Win

  3. #13
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    Quote Originally Posted by tb-av View Post
    There are targets here on M4C for a 100 meter Zero at 25 meters.

    I would get those and zero at 25 meters then move same target out to 75 yards. You should be able to get very close with that and the math from the other links. IOW, use target to verify math.

    Use some serach terms that contain these words.

    AIMPOINT 25 Yard Zero Target - For 100 Yard Zero

    I can't find the newer ones and this one doesn't have his name on it. I think the new ones are in meters and have his name. They have been posted several times.

    I can email you this target I have if you want.
    +1000. I used these targets to get a 100 yd zero and confirmed on the money...
    "Those who do can't explain; those who don't can't understand"...

  4. #14
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    Quote Originally Posted by tb-av View Post
    There are targets here on M4C for a 100 meter Zero at 25 meters.

    I would get those and zero at 25 meters then move same target out to 75 yards. You should be able to get very close with that and the math from the other links. IOW, use target to verify math.

    Use some serach terms that contain these words.

    AIMPOINT 25 Yard Zero Target - For 100 Yard Zero

    I can't find the newer ones and this one doesn't have his name on it. I think the new ones are in meters and have his name. They have been posted several times.

    I can email you this target I have if you want.

    I can vouch for those targets and they are spot on.

  5. #15
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    Quote Originally Posted by Failure2Stop View Post
    Just for general information on trajectory;

    I really like the web-based JBM Ballistics ballistic calculator.
    Holds good result if you get the input data right and I use it a lot to predict how much effect different variables have on end result.

    http://www.jbmballistics.com/ballist...culators.shtml

    All the info needed (BC, weight, diameter, atmospheric conditions, etc.) can be easily found, but it is always best if you can get real chrono data for your ammo and your gun. The wall of input fields can be daunting, but spending some time with the Google machine will get you enough information to fill in the fields with accurate enough data to be useful.

    Side note: I like to use 2,000 ft for elevation, as it gives good data for Sea Level to 4,000 ft out to 600 meters or so, unless you are going for high precision tasks.
    Have you or anyone used or looked at the KAC ballistic apps? There are 3 apps for 3 different levels of input.
    Op sorry for the hijack................apps are for Android and I phone
    Last edited by Blak1508; 04-02-13 at 13:39.


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  6. #16
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    If you adjust your sights to hit 1" low at 25 yards, you should be on paper when you increase your distance.
    Train 2 Win

  7. #17
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    100 meters is roughly 109 yards.

    200 is 219.

    Zero at about 1.5" low at 50 Meters and your POI at 100 will be at the top of your dot.

  8. #18
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    All of the "expedient" methods of zeroing at 25/50/75/35.2/etc. are simply that; placeholders/bookmarks in the zeroing process. A zero is only obtained at the actual distance at which you achieve point of impact at the desired reference to your sights. Sometimes you will be very close to the longer range zero desired, but there is no guarantee until you verify. I can't tell you how many folks show up with a "zeroed" carbine and aren't anywhere close when the target is actually 100, 200, or 300 meters away.

    One of the issues is distance error. Achieving zero at 90 to 110 meters (20 meters of error) will have less effect on trajectory than being off by a single meter in the 25 meter range (24 to 26 meters); .1 inch difference versus 2.5 inches at 300 meters.

    Another factor is that actually shooting precision fire from a supported position on a small target is relevant to 100 meter engagements, not so much for 25 meter engagements. That zeroing precision fire is directly relevant to most people's training goals. You become intimately familiar with reticle obscuration of target, optic (or sight) focus and parallax, and the requirement to call shots for group tracking (unless using higher powered optics).

    The way a group forms at 25 meters is usually different than how it forms at 100 to 200 meters, which means that your flight path will be more accurately predicted at long range by working off of a longer range zero.

    Of course, none of that helps if you don't have access to longer ranges. If you only have a 25/50/75 meter/yard range available, it absolutely makes sense to use a close-range zeroing method that replicates a 100 meter (or 200 or 300 or whatever makes you tingly) zero for close range work, but I urge folks to get out and get a no-shit zero at the distance that their expedient zero is purported to replicate. Once you have that, check it at 25 (or 50/75/14.7/whatever) to see where the group actually forms. I bet you will be surprised.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  9. #19
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    Quote Originally Posted by Blak1508 View Post
    Have you or anyone used or looked at the KAC ballistic apps? There are 3 apps for 3 different levels of input.
    Op sorry for the hijack................apps are for Android and I phone
    BulletFlight is a very handy tool if you have a zeroed rifle.
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  10. #20
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    @OP -- didn't realize the targets had their own sticky thread. You've probably already seen them... but there they are if anyone else is looking.

    https://www.m4carbine.net/showthread...red+dot+target

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