.223 Trajectory

[AnasaziDan]

For my AR15 M4 with my new MVF-515 Green, I have set my laser zero consistent with the 25 meter zero. I zeroed the laser prior to moving the rear elevation to 300 meter "battle" zero. My question is in regard to .223 trajectory. At 200 and 300 meters how many inches or centimeters high must I aim for a bullseye?*I realize I could go to the range, but I'd like a rough idea before I go.

Thanks ;)

[Win_94]

I use a ballistic calculator, then I know a lot of distances and other information.

I guess you need to know bullet ballistic coefficent, weight and muzzle velocity. I usually get that info from my reloading manuals but you can find what you want at a internet merchants site or the factory website.

Here is an easy ballistic calculator that I use. http://www.hornady.com/ballistics-resource/ballistics-calculator
I'll make a card to take to the field with me, then on the opposite side of the card I will write down the actual numbers.

[RKG]

As others have stated or implied, this question cannot be answered with precision with knowing more information than you have provided.

However, the following may help to get you in the ball park:

Rifle: US M4
Bullet: Win 55 gr. FMJBT
MV: 2750
Zero: 200 yards

Bullet Flight:

25yds - -1.0 in.
50 yds - +.2 in.
75 yds - +1.0 in.
100 yds - +1.6 in.
200 yds - +0.0 in.
300 yds - -8.7 in.
400 yds - -26 in.
500 yds - -55 in.

Bear in mind that all of these are theoretical numbers. They do not take into account variables in muzzle velocity, bullet imperfections, and a host of other factors that explain why group size is always larger than bore diameter.

[azredhawk44]

Depends on ammo.

And depends on your sight height from the barrel.

For an AR-15 with an A2 style 20" upper, a 25 meter zero with the rear sight set to 8/3 +1 click (adjust elevation at the front sight), moving the rear sight back to 8/3 will result in a 300 meter (330 yard) zero. A laser on such an A2, when zeroed at 25 meters, will result in a 300 meter coinciding zero.

That's because the bullet goes up to meet the sights at 25 meters, it's high from 26 to 299 meters, and falls back down at 300 meters. Its peak is about 150-175 yards and about 10 inches high from the line of sights.

An M4 is zeroed by setting the rear sight to the 6/3 setting (if a carry handle style sight is used) or to the 300 setting (if using one of the various BUIS style sights) and then adjusting elevation on the front sight.

All of this assumes you are using M855 62gr ammunition. M193 55gr ammo will be slightly different.

For more info, read the Army's Field Manual 3-22.9.

http://www.globalsecurity.org/military/library/policy/army/fm/3-22-9/