HELP : Can anyone figure a 200 yd zero for an AR-15 ???

[Riss]

Cannot find the bookmark for the ballistics program I was using. Have rifle zeroed dead nuts at 50 yds but need to know where the bullet will be at 200 yards. I am using an AR-15 carbine with a carry handle mounted scope for the long shots. Any help will save me hours of sleep. Have a 3 gun match coming up in about 9 hours and have to load yet.

 

[W.E.G.]

http://www.biggameinfo.com/BalCalc.aspx

 

[Boomerang]

I'm not sure about 50 yards, but here's the normal come-ups for distance.

Normal come ups.

- From the target to 100 yds = 2 min.
- From 100 yds to 200 yds = 2 min.
- From 200 yds to 300 yds = 3 min.
- From 300 yds to 400 yds = 3 min.
- From 400 yds to 500 yds = 4 min.
- From 500 yds to 600 yds = 4 min.
- From 600 yds to 700 yds = 5 min.
- From 700 yds to 800 yds = 5 min.
- From 800 yds to 900 yds = 6 min.
- From 900 yds to 1000 yds = 6 min.

 

[Riss]

I think that calc will do it. Just need to find out the ballistics for the 223 Federal.

 

[W.E.G.]

http://www.ar15.com/lite/topic.html?b=2&f=134&t=149575


XM193 VELOCITY DATA
_________________________________


7.5" 2364 FPS ... 10.5" 2755 FPS
DIFFERENCE 391 FPS
DIFFERENCE/INCH 130 FPS PER INCH

10.5" 2755 FPS ... 14.5" 2984 FPS
DIFFERENCE 229 FPS
DIFFERENCE/INCH 57 FPS PER INCH

14.5" 2984 FPS ... 16" 3075 FPS
DIFFERENCE 91 FPS
DIFFERENCE/INCH 61 FPS

16" 3075 FPS ... 18" 3245 FPS
DIFFERENCE 170 FPS
DIFFERENCE/INCH 85 FPS

18" 3245 ... 20" 3254 FPS
DIFFERENCE 9 FPS
DIFFERENCE/INCH 4.5 FPS

 

[rangerruck]

mmm..., that's a nice graph there w.e.g. I typically don't zero a ar at 50 yds, but with open sites, it seems to have a pretty good reach with a bbl at least 18 inces long.

 

[Riss]

Calc says that for the XM193 that I am using 55gr .223, that I should listen to the standard rule of thumb. Sight in at 50 yards and bullet will cross over line of sight again at 250 yards or there about. 200 yards its still 2" high from point of aim. Sweet, thanks for the calculator.

 

[Lovesbeer99]

Look up the website for the JBL trajectory calculator. put in your rifle, distance, BC, velocity, and it will calculate the trajectory for you.

By the way, why zero at 50 yards? If you zero at 25 you get same point of inpact at 300. This is my understanding of the military 300 yard zero.

 

[briansmithwins]

50 yard zero is more real world friendly.

http://groups.msn.com/TheMarylandAr15ShootersSite/zeroingmethods.msnw

BSW

 

[Riss]

Maryland Shooters Website appears to have lots of information, but I do not have MSN and cannot log in to see the information.

 

[CB900F]

Riss;

My suggestion, go to: www.hornady.com/ballistics. Everybody should be bookmarking that site.

900F

 

[another okie]

50 yards is about right for 200, in my experience, and about three inches high at 100. But that is not scientific or based on thousands of rounds at the bench. I zero scoped rifles at 100, but I do have my AR zeroed at 50 and it seems to be about on again at 200.

 

[MCgunner]

http://www.snipercountry.com/ballistics/index.html