Bullet Trajectory of 5.56

Discussion in 'AR-15 Discussion' started by sublime42283, Mar 9, 2012.

  1. sublime42283

    sublime42283 New Member

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    I have been doing some calculations of the trajectory of a 5.56 mm Federal Ammo M855 62 grain round. I am competing in a sniper challenge here in Ohio and they have a 1000 yd shot during this competition. I have never shot my AR-15 at 1000 yds and have a HWS with 3x magnifier with a .5 MOA dot and 65 MOA cirlce so I need to try and figure out the calculations before the competition. I guess what I am asking is if anyone here has any other info on the trajectory of the round I use. I just want to be able to try and calculate the shot.
     
  2. JTJ

    JTJ Well-Known Member Supporter

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    There are several very good ballistics programs on the net and apps for some to use on a droid. Google ballistics programs.
     

  3. cfraga1978

    cfraga1978 New Member

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    I think you should get some good long range glass for a "sniper competition" 1000 yards with a red dot will not be easy. And maybe look into some match grade or handloads. But that is just my opinion.
     
  4. c3shooter

    c3shooter Administrator Staff Member

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    Firearm type Match Sight Height 1.5
    Bullet Weight (grains) 62 Ballistic Coefficient .238
    Muzzle Velocity (fps) 3100 Temperature 68
    Barometric Pressure (hg) 29.53 Relative Humidity 78%
    Zero Range (yards) 100 Wind Speed (mph) 0



    Ballistics Table in Yards 62 gr., .238 B.C. www.hornady.com

    Range (yards) Muzzle 100 200 300 600 800 1000
    Velocity (fps) 3100 2708 2348 2016 1236 987 860
    Energy (ft.-lb.) 1323 1009 759 560 210 134 102
    Trajectory (100 yd. zero) -1.5 0.0 -3.3 -12.9 -108.3 -276.6 -572.4
    Come Up in MOA -1.5 0.0 1.6 4.1 17.2 33.0 54.7




    The following table is provided as a "cheat sheet" that you can tape to your gun.
    Ballistics Table in Yards 62 gr., .238 B.C. www.hornady.com

    Range (yards) Muzzle 100 200 300 600 800 1000
    Trajectory (100 yd. zero) -1.5 0.0 -3.3 -12.9 -108.3 -276.6 -572.4
    Come Up in MOA -1.5 0.0 1.6 4.1 17.2 33.0 54.7


    --------------------------------------------------------------------------------
     
  5. sublime42283

    sublime42283 New Member

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    I know I should, but I don't have the cash right now and I just recently thought about entering into the competition. The full competition only has the one 1000 yd shot so I don't want to buy a good scope that will make it harder to make other shots at closer distances and other non scoped shots.
     
  6. sublime42283

    sublime42283 New Member

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    I did find that the Federal M855 has a BC of .250 so I used a calculator and came up with a bullet drop of 480 inches for that round.
     
  7. purehavoc

    purehavoc New Member

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    are you going to have it zeroed at 200 ? If so a 69 Gr Sierra Matchking will fall off about 48.5" at 500 yards . You got anything bigger for you 1000 yard shot or is it limited to .223/ 5.56 ? If I was going to be shooting that far I would be looking at 6.5, 7mm, .338 lapua, .308 etc
     
  8. sublime42283

    sublime42283 New Member

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    .338 is the largest caliber for the match. I can only use one rifle and I only have the AR. It is zeroed at 100 yds and I want to keep it there. I am just shooting the competition to have some fun and see if I can actually compete. I know I can shoot, I was an expert rifleman in the marines and just wanted to see how good I am in the terms of other people. I am not expecting to go out there and beat everyone, just want to get a feel of how these competitions go and what it is like.
     
  9. sniper762

    sniper762 New Member

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    Your scope will not have enough elevation adjustments for 1000 yds zero.
    a base that is thicker in the rear or shimming is required
     
    Last edited: Mar 9, 2012
  10. purehavoc

    purehavoc New Member

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    Thats what I was getting ready to say , it will probably be a guessing game after 600-700 or so yards with your dot. I think even with the 24X scope I have 600-700 is off the marks and out of the picture at full zoom for .223 / 5.56
    Never hurts to try but the 5.56 isnt going to have a chance up against the flat shooting .338
     
    Last edited: Mar 9, 2012
  11. AgentTikki

    AgentTikki New Member

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    .....m855 at 1000 yards? A HWS with a .5 moa dot? 3x for 1000 yards? Is it april already?
     
  12. c3shooter

    c3shooter Administrator Staff Member

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    Would also mention, in addition to elevation, wind plays a major role at that range. Unless you have a dead calm, or wind straight up and down range, expect that bullet to do some walking. You might want to run some calcs on various winds at that range, and have them on a cheat sheet.

    And please excuse my bringing this up- but is the distance 1000 yards, or 1000 meters? I ask for a reason- saw a gent that had his dope down for 1000 yards, and the match was 1000 meters- which is not quite 94 yards FURTHER.
     
  13. sublime42283

    sublime42283 New Member

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    I am not too worried about it I have made a little cheat sheet and have figured what the windage would need to be at 10 mph and from there I can estimate and adjust. I am going to be taking the shot using straight kentucky windage and elevation adjustment. So we will see how it goes. I just wanted to see if anybody had any other info on the MOA adjustments at that range. I have done a bit of research and gotten some pretty good estimates. I am not expecting to hit the target at that range, but if I do using the aim high and right or left method then all good. Thank you all for the info...I will update and let you know if I hit it...
     
  14. Fumbles

    Fumbles New Member

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    LOL.......except.... he could get lucky.

    [ame]http://www.youtube.com/watch?v=JDTdiE93cj8[/ame]
     
  15. AgentTikki

    AgentTikki New Member

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    M855 has a well deserved bad reputation for being one of the worst choices for precision shooting. The main problem lies with the inconsistent placement of the steel core in the copper jacketing. The best you can expect from it is probably 1.5 moa to 3moa. That's a spread of 15 to 30 inches at 1000 yards. That coupled with a lightg 62 grain weight (it'll get tosses around by the wind very easily) make it a bad choice for you.

    Consider somthing heavier, 77 smks. 80 vlds. Etc.
     
  16. AgentTikki

    AgentTikki New Member

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  17. sublime42283

    sublime42283 New Member

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    Maybe I will go out and look at some heavier ammo. My barrel twist is 1:9 and everything that I have read says 72 is the heaviest grain for 1:9. Now I have to refigure the bullet drop with a 72 grain bullet. We will see what happens.