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Old August 12, 2013, 12:09 PM   #33
Metal god
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Join Date: April 10, 2012
Location: San Diego CA
Posts: 3,375
I was just running some numbers through my ballistic calc for the AR with a 55gr bullet at 3000fps. IMHO If you want the best zero for home defense , the 100yd zero is best . Like what was said above . There is NO way to make up for your barrel being below the optic or sights with said sight . No matter where your zero is the bullet will leave the barrel 1.75" to 2" below the sights . Knowing this to be true a 100yd zero will be 1.75" low at the muzzle . dead on at 100yds and 1.75" low again at 175yds . That gives you an extreme spread of 1.75" all the way to 175yds . In contrast the 25yd zero would put you 3.5" high at 100yds with an extreme spread of 6" out to 300yds . A 25 foot zero would put you some where around 12" to 16" high at 100yds and the extreme spread would not even be worth talking about .

So it looks to me that for HD/SD the 100yd zero is best for your AR .
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If you have some time IMO this is worth a listen/watch but it takes a few minutes to really get going .
https://www.youtube.com/watch?v=04wyGK6k6HE or a picture of Mohamed https://www.youtube.com/watch?v=1VwpwP_fIqY
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