Need help with trajectory information

[bigbore4570]

Can anyone help me with the trajectory for a .223?

Here are the variables: 1. ammo is Ultramax 55 gr. Nolser Ballistic Tip; 2. per Ultramax, the ballistics for the round are 3000 ft/sec muzzle velocity and 1099 ft-lb muzzle energy,I don't know what barrel length they use for these results); 3.the rifle being used is an AR build with an 18 inch barrel length; 4. the rifle has a flat top receiver and uses a Larue mount for the Leupold---this puts the center of the optic approximately 2.75 inches above the center of the bore.

The rifle has been zeroed for 100 yards. What I'm trying to find out is : 1. what does the bullet flight path look like per the variables listed-- in other words, is the trajectory still rising at 100 yards; 2. where would the POI be at 200, 300, 400 yards, per my 100 yard zero.

I apologize for the limited amount of information. I don't have a chronograph and don't have access to a range beyond 100 yards at this time.I realize that any info will be approximate, but appreciate any info regardless.

If no one has the software or tables to calculate this information, cqan you direct me to a website or source to answer my questions.

Thanks in advance

Jack

 

[Cheechako]

Jack

Here is a ballistic program that most anybody can use. Get the Ballistic Coefficient,BC)of the Nosler bullet from the drop-down window,should be about 5). Plug it in along with the other factors and click on calculate. It's that simple. In an 18" barrel you will not get the published velocity of 3000 fps. It was probably out of a 24 or 26 inch barrel so you will have to adjust it downward. Maybe as much as 200 or 300 fps. Maybe another reader has experience with that particular rifle and can give you a better estimate.

If you have any questions or get stuck, let us know and somebody will to help you.

Good Luck

http://www.eskimo.com/~jbm/ballistics/traj_basic/traj_basic.html

Ray

 

[Cheechako]

Jack

I steered you in a wrong direction. The BC of the Nosler 55 gr Ballistic Tip is 267. Use G1. The results won't be 100% accurate because one of the biggest factors is mv and you'll be making a guess at it.

Ray

 

[bigbore4570]

Thanks Ray. I appreciate your help.

Jack

 

[bigbore4570]

Dave
Thank you for the help. I was surprised to see how much difference 200 fps makes at 300 yds.

Jack

 

[JER]

Muzzle Vel.....200yds....300yds....400yds
...2800.........-2.98.......-13.4.......-33.8
...2900.........-2.54.......-12.0.......-30.6
...3000.........-2.21.......-10.8.......-27.8

At 200 yds you're within 1/2 minute of Prarie Dog, at 300 yds you're groundhog good, at 400 yds you need a little taller target,Osama comes to mind).

Or simply dial up more elevation on the scope. At 3000 fps, just click up 7 MOA from 100 yards to be dead on at 400.