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-   -   Newb zeroing question (http://www.firearmstalk.com/forums/f20/newb-zeroing-question-79628/)

jack80 12-28-2012 05:38 PM

Newb zeroing question
 
I'm trying to zero my Ruger SR556 and my back yard is sloped down about 15 degrees or so. That shouldn't have any effect at only 50 to 100 yards right?

fsted2a 01-03-2013 04:33 PM

Quote:

Originally Posted by jack80 (Post 1069419)
I'm trying to zero my Ruger SR556 and my back yard is sloped down about 15 degrees or so. That shouldn't have any effect at only 50 to 100 yards right?

First, are you zeroing iron sights or scope? If iron sights, you zero at about 25 yards, then set your windage knob forward. If you are zeroing a scope, start at 50 yards, then walk your way forward in 25 yard increments. Be a good idea to invest in a spotting scope to save walking back and forth every 3 round shot group, whether scope or iron sights are used. Learn to use the tics on the reticle as a bullet drop compensator to adjust for elevation and windage. The art of marksmanship involves making tweaks in your technique for environmental considerations not found in a sterile indoor range.

jack80 01-03-2013 07:36 PM

Thanks for the info. It's just my iron sights right now. I didn't know you were supposed to do it at 25 yards, I thought it was supposed to be 50. Shows how much I know haha

racer_x 01-03-2013 08:20 PM

Hornady ballistic chart

223 55g vmax -1.5 muzzle, 1.4 100yrd, 0 200yrd, -7.0 300 yrd, -21.4 400 yrd, -45.9 500 yrd

556 55g gmx 20" barrle -1.5 muzzle, 1.6 100yrd, 0 200yrd, -7.8 300yrd, -23.9 400yrd, -51.5 500yrd

mayb that will help ya some I zerod mine at 75yrds

ZeusEcho 01-03-2013 09:39 PM

I would sight irons and red dots (non magnified) at 50 yds. Most 223 and 556 will then also be close to zero at 200 yds.

Magnified scope I would sight at 100 yds.

I thought your original question though was more related to angle of the shot (15 degree decline) and how that would affect the bullet drop. It will have an affect but at 50-100yds its probably not significant.

purehavoc 01-03-2013 10:06 PM

Maybe this will help, I like to use the 50/200 it keeps the drop alot closer together

http://img.photobucket.com/albums/v5...ulletpaths.jpg

jack80 01-03-2013 11:27 PM

Quote:

Originally Posted by ZeusEcho

I thought your original question though was more related to angle of the shot (15 degree decline) and how that would affect the bullet drop. It will have an affect but at 50-100yds its probably not significant.

Yeah that was the original question. I figured at such a short distance it wouldn't matter but just wanted to double check.
Thanks for the info guys. As soon as I get home from the oil patch ill try it out

fsted2a 01-04-2013 01:17 PM

Quote:

Originally Posted by jack80 (Post 1078184)
Thanks for the info. It's just my iron sights right now. I didn't know you were supposed to do it at 25 yards, I thought it was supposed to be 50. Shows how much I know haha

Army manual (TM 23-9) say do it at 25 meters, which equals about 30-35 yards. 50 yards should be good to go. If you do it that way, you will keep it on the paper. After that, it is more up to your marksmanship fundamentals (Breathe, Relax, Aim and Squeeze). Not knowing what your skill level was and basing your question off the title of the thread is how I based my esponse.

70cuda383 01-04-2013 03:01 PM

Quote:

Originally Posted by jack80 (Post 1078184)
Thanks for the info. It's just my iron sights right now. I didn't know you were supposed to do it at 25 yards, I thought it was supposed to be 50. Shows how much I know haha

Quote:

Originally Posted by fsted2a (Post 1079341)
Army manual (TM 23-9) say do it at 25 meters, which equals about 30-35 yards. 50 yards should be good to go. If you do it that way, you will keep it on the paper. After that, it is more up to your marksmanship fundamentals (Breathe, Relax, Aim and Squeeze). Not knowing what your skill level was and basing your question off the title of the thread is how I based my esponse.


Yea, at the end of the day, it's all on you and your personal preference. look at the ballistic chart above, and notice how your bullet flight path changes based on a 25, 50, 75 yard zero. as long as you know and understand what your bullet is doing in flight, it doesn't matter if you zero at 25, 50, or 75 or even 100.

fsted2a 01-04-2013 03:49 PM

Quote:

Originally Posted by 70cuda383 (Post 1079445)
Yea, at the end of the day, it's all on you and your personal preference. look at the ballistic chart above, and notice how your bullet flight path changes based on a 25, 50, 75 yard zero. as long as you know and understand what your bullet is doing in flight, it doesn't matter if you zero at 25, 50, or 75 or even 100.

Skill level has a lot to do with it too. If you are comfortable zero at 100 yards, go for it. If you have never picked up an AR before, 25 or even 15 is recommended. I personnaly know some guys who don't have a problem setting their weapon at mechanical zero and going to the range and qualifying expert without bothering to shoot a few rounds to zero.


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