223 trajectory

This is a discussion on 223 trajectory within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; I'm trying to find out how far a 223 goes in a straight line. I have a box of federal 22 that says on it ...

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Thread: 223 trajectory

  1. #1
    Senior Member Array rmilchman's Avatar
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    223 trajectory

    I'm trying to find out how far a 223 goes in a straight line. I have a box of federal 22 that says on it the bullet will drop about 5 inches in a hundred yards. I can not find anything on 223.

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    VIP Member Array edr9x23super's Avatar
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    Those tables are all over the net; Just look up the SS109 ammo, here is a link I found. Most other .223 ammo ( I am assumoing you are going to use this in an AR?) will be pretty close.

    http://www.hgmc.hu/dani/suli/pusk%E1...ER/556X453.TXT
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    Technically, the bullet starts dropping as soon as it leaves the barrel.

    No gun shoots in a straight line. You can compensate by adusting the sights to hit the point of impact at a given range, but it'll only be set for that range because of the trajectory.
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    VIP Member Array nedrgr21's Avatar
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    It doesn't.
    What's the BC?
    What's the bullet weight?
    What's the initial velocity?
    What distance is the rifle zeroed for?
    What's the sight height?

    Go to Remington's and Winchester's websites and play with their online ballistic calculators.

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    Distinguished Member Array kazzaerexys's Avatar
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    The Ammo Oracle at AR15.com has a very thorough discussion of the ballistics of several types of 5.56mm/.223Rem ammunition through different platforms.
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    Here is a calculator that can figure out anything that you need and it is pretty danged accurate.
    JBM - Calculations
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    Senior Member Array rmilchman's Avatar
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    Thanks for all the links I have a lot of reading to do. I will be using an AR, what I'm trying to figure out is if I sight in at 100 yrds or 200 yrds, how off would I be at around 25 yards.

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    Distinguished Member Array kazzaerexys's Avatar
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    That's actually fairly easy---you will be off by the sight-to-muzzle offset. That is, if you are zeroed for 100yds, your sights will be a couple inches high of impact at 25yds with a standard AR-15 fixed front sight.
    “What is a moderate interpretation of [the Constitution]? Halfway between what it says and [...] what you want it to say?” —Justice Antonin Scalia

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    Quote Originally Posted by rmilchman View Post
    Thanks for all the links I have a lot of reading to do. I will be using an AR, what I'm trying to figure out is if I sight in at 100 yrds or 200 yrds, how off would I be at around 25 yards.
    If you zero at 50 yards, you'll be dead on at 200 yards and within 2 inches (above or below) of point of aim out to 250 yards. Pretty much the same for 55 and 62 grain ammo.
    Smitty
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    Senior Member Array rmilchman's Avatar
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    Quote Originally Posted by gasmitty View Post
    If you zero at 50 yards, you'll be dead on at 200 yards and within 2 inches (above or below) of point of aim out to 250 yards. Pretty much the same for 55 and 62 grain ammo.
    Thanks

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    VIP Member Array nedrgr21's Avatar
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    Here's the easiest way to figure it out. Sight in your rifle about 3/4 to 1" low at 25 yds. You'll be within 4" of your 100 yd zero (high/low/left or right - this works with all centerfire rifle cartridges from 17 to 416 with the exception of those that sling a hunk of lead like .444, 45-70, etc, those need POI 1" high). Get your 100 yd zero and move the target back to 25 yds. Adjust your POI 2" high at 100, move to 200 yds. Zero at 200. Move to 25 again.

    Remember, when adjusting your sights if your scope or sights are 1/4 MOA it takes 16 clicks to move POI 1" at 25 yds, and 2 clicks at 200 yds.

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