Ok so recently I purchased a Eotech 552 for my AR15. I purchased some Fiochi .223 to zero (Irons and Red Dot) on my friends farm. We were only able to zero at about 35-40 yards (guesstimate) at a 10 degree up angle (roughly). My question is what distance would I be zeroed for? If a 25 yrd zero is for 300 and 50 is for a 200yrd zero would 35-40 be around 250ish yards. That's my thinking IF I understand everything right. My second question would be if the slight up angle would affect the zero at all? As always any help would be appreciated.
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August 30, 2009, 12:56 AM
My Marine friend told me a 36 yard zero should put you dead on at 300 yards.
He's an expert marksman, FWIW.
August 30, 2009, 01:16 AM
Generally, 25-30m = 300m and 50m = 200m. That's fairly rough though. If you want to get exact, you really need to determine which ammo you are going to zero for, find out the ballistic coefficient of that round and muzzle velocity from your barrel. Then plug that into a ballistics calculator.
August 30, 2009, 06:27 AM
yes, the up angle will def effect you, with a short zero like that, becuase it has to climb that much higher, in such a short space, and you are not even zeroing with the irons. I would say, it was more like you doing a 20 yd zero.
August 30, 2009, 11:14 AM
What are you zeroing for? :) If you plan for a HD sort of role, your probably set. For critters, I much prefer a 100y zero so I can place the bullet a bit closer to POA.
In any event, the only way to know where your bullets will hit is to actually put targets up at distance and shoot. :)
August 30, 2009, 09:57 PM
This may help also.
chapter 9 Zeroing or specifically for range (9007. battle sight zero). pages 9-5, 9-6
August 30, 2009, 10:04 PM
I'm not a big fan of the 300m zero. With a 50y/200m zero, it shoots much flatter over a more usable range.