If I zero my AR at 100 yards...

[Balrog]

If I zero an AR with 16" barrel, am shooting 55g M193, and zero at 100 yds, where is bullet at 25 and 50 yards? Where is it at 150 and 200 yds?

Does anyone have a graph that shows this?

 

[BigBL87]

Using Federal XM193's balliatic data and an assumed muzzle velocity of 3050 fps (seems to be an average across what I looked up), here's what Strelok put out for me.

 

[jmr40]

Your best bet is to use one of the online calculators. And there are several other factors that come into play. What type of sights, and how high above the bore are they? You can input sight height in this calculator. The default is 1.5", but many AR's have sights higher than that.

Ballistic Calculators - Hornady Manufacturing, Inc

You may have to guess at the bullets BC and actual muzzle velocity. BC is going to be about .240ish.

Ball Park estimate is that you'll be at about 3100 fps and that means around 1/4 to 1/2" low at 25-50 and again at 150. About 3" low at 200. At only 200 yards there isn't much difference regardless. It is when you get out to 500+ that minor differences at the muzzle show up at longer range.

 

[brasscollector]

You can play around with numbers here, even compare diff bullets and diff cartridges.

 

[nipprdog]

Many of us use the 50/200yd method. Zero at 50, and you're within 1-2" at 25-200yds.

That's with iron sights. Is that what you're using?

 

[Balrog]

Many of us use the 50/200yd method. Zero at 50, and you're within 1-2" at 25-200yds.

That's with iron sights. Is that what you're using?

Using Trijicon MRO

 

[Telum Pisces]

It's all a guess because we don't know how high your scope is mounted etc...

 

[Balrog]

It's all a guess because we don't know how high your scope is mounted etc...

Standard AR sight height, about 1.5" above bore.

 

[TimRB]

Using Trijicon MRO

How big are your best groups? The red dot on a Trijicon MRO sight is two minutes.

Tim

 

[12Bravo20]

DELETE

 

[Balrog]

How big are your best groups? The red dot on a Trijicon MRO sight is two minutes.

Tim

Shooting at 100 yards today with M193, about 3-4" was best I did, but didn't measure.

 

[Zak Smith]

Standard AR sight height, about 1.5" above bore.

On an AR15 with iron sights, it's 2.6"

 

[TimRB]

Shooting at 100 yards today with M193, about 3-4" was best I did, but didn't measure.

I don't know what kind of target you're using, but I would bet that the two-minute dot is making it hard to point the rifle at the same spot for each shot. You might consider making a special target that has a two-minute (or maybe slightly larger) aiming black so you can get your sight centered on it each time.

Tim

 

[ericuda]

https://www.federalpremium.com/ballistics-calculator

I use this one.

 

[Driftertank]

Standard AR sight height, about 1.5" above bore.

I think that's about 1.5" above the rail, 2.6 above the bore. IIRC

 

[Balrog]

I think that's about 1.5" above the rail, 2.6 above the bore. IIRC

Yes my mistake.

 

[Balrog]

https://www.federalpremium.com/ballistics-calculator

I use this one.

Yes thanks, exactly what I was looking for.

 

[trackskippy]

If you want a simple visual idea, these make things easy.....

http://arma-dynamics.com/zero-considerations.html

This is the best ballistic calculator Ive come across. If you want to drive yourself nuts, it will accommodate

Its very useable and lets you figure all sorts of stuff out.

https://www.jbmballistics.com/ballistics/calculators/calculators.shtml

 

[Andrewsky]

I have a couple suggestions for you.

1) Don't literally zero so that POI = POA at 100 yards. If you do that then you will have to hold over if shooting further. For practical shooting you want to be holding under, not over so you have a better view. At least have it shoot a few inches high if you insist on doing your sighting at 100 or if that's all your range has.
2) 100 yards is kind of a long ways in terms of needing to worry about wind. If it's quite windy out you could see some deflection.

I personally zero my ARs 1" high at 50 yards. That'll be about 5" high at 200 and right on at 300. A lot of people zero them to be right on at 50 which also puts them on at 200.

 

[dcloco]

You will be zeroed at 100 yards.

Go shoot at distance.

 

[entropy]

I copied this from somewhere 13 years ago; the zeroing range is 25 meters. M193 ball will be back at 0 at @ 265 meters.

trajectory (in.) drop (inches) drift (inches)* From 20" M16A1 for M193, 20" M16A2 for M855 issue sight 2.5" above bore.
range M193 M855 M193 M855 M193 M855 M193 M855
(meters) MV MV TR TR Drop Drift 5MPH
0 3,200 3,100 -2.5 -2.5 0.0 0.0 0.0 0.0
100 2,774 2,751 +2.8 +4.4 -2.2 -2.3 1.3 1.1
200 2,374 2,420 +2.7 +5.8 -9.9 -10.2 5.8 4.9
300 2,012 2,115 -4.9 0.0 -25.1 -25.3 14.2 11.8
400 1,680 1,833 -23.0 -15.0 -50.8 -49.5 27.6 22.4
500 1,373 1,569 -56.2 -42.9 -91.6 -86.7 47.5 38.0
600 1,106 1,323 -113.1 -88.2 -156.1 -141.3 76.4 59.5
700 995 1,106 -206.8 -156.1 -257.3 -220.9 113.5 88.4
800 927 1,010 -339.9 -267.7 -398.0 -339.2 156.1 124.9

 

[Riomouse911]

If you want a simple visual idea, these make things easy.....

http://arma-dynamics.com/zero-considerations.html

This is the best ballistic calculator Ive come across. If you want to drive yourself nuts, it will accommodate

Its very useable and lets you figure all sorts of stuff out.

https://www.jbmballistics.com/ballistics/calculators/calculators.shtml

These are the best ones. I use them at work for visuals before we go zero.

We zero at 50 yards, you’re (allegedly) good for torso hits to 300 with a center torso aim.

Stay safe.

 

[Driftertank]

For a 16" carbine, I like a 50/200 zero. Emphasis on the 200, but I find with standard AR sight height, 50 will get you on paper at 200, and once set at 200, you won't be more than 3-4" high or low out to 250+
That's good for poppers, milk jugs, marmots, 'yotes, etc.

 

[Hesa Hard1]

* * * I personally zero my ARs 1" high at 50 yards. That'll be about 5" high at 200 and right on at 300. A lot of people zero them to be right on at 50 which also puts them on at 200.

Or, with 55gn ball (M193), just establish a zero @ 36yds, and then verify POI @ 300yds. Adjust as needed.

The bullet, putting shooter-induced error aside, shouldn't rise or fall more than 2" along the path between the 36yd zero and the 300yd mark.

It's a very flat-shooting zero.

 

[Skeeter330]

I set mine 16 in bushmaster with the revised improved battle sight zero. Works great with 55 & 62 gr. My rifle shoots the 62 gr better and it is point of aim point of impact. with 55 gr i have to shoot apple on a post but worked out to 300. I have yet to try 4, 5 or 6 hundred with it

The type of ammo you use will effect velocity. I load my own so your mileage will vary