.223 Trajectory Help

[Lovesbeer99]

So I'm using a scoped rifle and I'm sighted in at 100 yards.
How many minutes of elevation do I need to shoot at 200 yards, and at 300 yards?

I know about ammo and elevation, and etc, but I'm looking for a starting point and/or rules of thumb. Once I make the adjustment to get on paper I'll dial it in and record the results in my log.

Thanks
Lovesbeer99

 

[Jim Watson]

An accurate reply would require you to furnish the bullet used and its actual (not advertised) muzzle velocity; and me to fire up the Sierra Infinity ballistics disk.

If you will use a good size target and actually shoot the gun, the "come-up" from 100 to 200 is only 1.7-2 MOA and from 100 to 300 only 3.5 - 5 MOA, depending on the load as above.

 

[Ol` Joe]

Go here and download "Point Blank" it is a ballisitics calulator that you put your data in and get a graph of what your load will do. It`s free.
http://www.huntingnut.com/
There are lots of other calculators on the web but, I`ve played with this and was happy with the results. I can`t comment on the others as I have`nt tried them.

 

[skinewmexico]

The JBM Ballistics calculator is good too, you might google it. It showed my 223 needed to be 12" high @ 100 to be on @ 500, with a 77g SMK @ 2750 FPS. It was 12" high @ 500, so Black Hills must have posted the wrong velocity.

 

[Lovesbeer99]

thanks for the replies, but no reason to be so specific. Just a good reference point so that I can get on paper than make corrections. I'm not trying to set the scope and expect 10x hits off the bat.

One of the replies suggests between 3.5 -5 moa. So that's about 12-15 inches at 300 yards. A quick check on the winchester site for whitebox ammo makes this a good starting point as I have sighted in with a short range trajectory.

Thanks - I'll try it at 4 moa and see if I hit paper.

Regards,
Lovesbeer99

 

[rcmodel]

Don't bother to zero it at 100 yards.

Sight it in about 1 1/2" high at 100 yards.

That will put you very close to zero at 200 yards, and 7" - 8" low at 300 with most 55 grain loads.

You fine-tune it from there with the specific load you are using.

rcmodel

 

[sacp81170a]

Another thing you need to know for the ballistics programs is your barrel length and the height of the centerline axis of the scope above the centerline axis of the bore. If you're zeroed at 100 with a .223 you should easily still be on paper at 200. 2-4 moa should get you pretty close, but you might just try it without adjusting at all and seeing where you're hitting.

If your reticle is marked in mils or some other fashion, you can determine your holdover and shoot off the markings on your reticle. Unless you're shooting competition, windage at 200 yards even with a 15 mph full value wind is negligible for "minute of deer" purposes. If it's "minute of prairie dog" that you're looking for, then yes, it does make a difference.

 

[cracked butt]

go up 2moa for 100 t0 200, go up 3 moa from 200 to 300- that should get you very close.

 

[rangerruck]

if your scope knobs say 1/4 at 100, then go up 6 clicks for 200, go up another 12 clicks, for 300.