I tried it - it works!!!
You should see my misses at 400M now…
Thanks for answering my questions.
Would you please explain this? No lo comprendo.
Sorry, “W” as in “win”.
This is why I generally avoid sports references 
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I’m an inter-city LEO using a 16.1" Colt 6920 as my Patrol Rifle. Most of my potential engagement distances are well within 50 yds. But some school hall ways can get almost to the 100 yd range, not to mention large parking lots of business, grocery stores, Wal Marts, ect.
I’ve been using the 50/200 yd zero since we instituted the Patrol Rifle program, but lately have been giving more thought to the 100 yd zero.
The more I thought about it, the more I felt it had merit for my needs.
Thanks for posting this F2S. You managed to explain it in such a way that even I can understand. You’ve sold me on the concept.
Great write up! I’ll be using this technique on Saturday when I sight in my RDS.
This is a great explanation. Thank you for taking the time to post this! I have always used the 25M zero (only way I’ve been trained in the service). I wish line units would take the time to consider the merits of the 100M zero.
Great explanation dude, thanks for taking the time to explain and show details.
F2S, when I first got my AR I didn’t know which zero to use. I went out to the indoor range and zeroed it to 25 yards. I read your article on your site and was impressed with the explanation. My first trip to a 100 yard range, I zeroed it to 100 yards. It has worked well in the tactical matches I’ve been shooting too.
My apologies if this has been addressed elsewhere, but for your POA with a red-dot, do you prefer to use the center of the dot as your reference point, or do you use the top edge of the dot for greater precision? I suspect that it’s less of an issue with the 2 MOA dot, but I’m just curious.
Thanks for the great summary.
I use the center of the dot as the apparent size of the dot will change with varying intensity, illumination, and background color.
Will you make this thread a Sticky or add it to the AR15 Zeros and Trajectories Sticky?
100 m zero guy here for the reasons stated. However, I initially used it because I got an ACOG, and it was calibrated for a 100 m zero.
Regarding irons, I like the Revised Improved Battlesight Zero, but you need the A2-style drum rear sight to implement it. This scheme provides the ability to use the small aperture with an approximate 100 yard zero, the large aperture in the standard 50/200 range, and the small aperture again from 300 yards out using the drum.
F2S, great explanation on how it works. I did the ground work for the 100m zero on our 25m indoor range and did a quick field test on it out at an LE 3 gun match last Saturday. The 25m ground work put me dead on (pure luck I think) and I was able to shoot fairly competatively, at least in the rifle portion. I am going to be working to get all of our folks swapped over to the 100m zero on thier rifles, in this line of business it just makes to much sense.
+1 on making this a sticky.
Thank you very much this is great information!
You sold me. I’m all for less guesswork, less variables, less math.
Thanks for taking the time.
Well written and the graphics clearly illustrate the point. This is typical of why I pay attention to what F2S posts
Excellent info here. This is exactly the type of information I was interested in when i broached this topic last week…thankfully a member here sent me your link. Great work!
For those running with an EOTech, I found this quick range estimation diagram. Basically, if your target is standing inside your 65moa ring, your range is roughly 100m.
don’t you mean yards?