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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/25/2005 3:53:00 AM EDT
I picked up an ACOG TA31F over the weekend for my Bushy 20" flattop and the other day went to the indoor range to do a 25 yard prelim sight-in before I get to the 100 yard outdoor range I shoot at.

After spending about 2 hours running calculations to determine where my POI should be relative to my POA for XM193 for the 25 yd - 100 yd conversion (by my numbers, using the 100 yard reticle mark it worked out to 1.79" low), I drummed up some modified targets and headed out. Initial groupings were about 3 inches left and 6 inches high, so I adjusted, readjusted and finally got my initial 25 yard zero. I checked as per the 25 yard sight-in in the manual, and using the 200 yard reticle mark I was dead on bullseye at 25, that tells me I used the correct POI offset (i.e. using the 100 yard reticle I was 1.8 inches low, using the 200 yard I was dead on bullseye using the bullseye center as POA at all times).

Now for my question: Does anyone know what the max elevation and range adjustments are for this ACOG, and/or for ACOGs in general? I sure don't want to max out the adjustment range and either a) extend it past it's range or b)not have enough adjustment left to do fine tuning when I finally get out to the 100 yard (or further) range. In other words, if one were to "shoot the square" how many clicks in windage and elevation would the "square" be?
Link Posted: 8/25/2005 11:40:22 AM EDT
[Last Edit: 8/25/2005 11:40:45 AM EDT by Forest]

Originally Posted By FredMan:
After spending about 2 hours running calculations to determine where my POI should be relative to my POA for XM193 for the 25 yd - 100 yd conversion




You spent 2 hours doing this? Were you doing it by hand? Use of any of the freely available ballistic calulators would have done the same in 10 seconds.

If you need one let me know.

As for the amound of elevation and windage - if it's not included in the manual I wouldn't worry about it. Run a box 12-15 clicks per side (that should be 4"-5") and call it good.
Link Posted: 8/25/2005 6:10:39 PM EDT

Originally Posted By Forest:
You spent 2 hours doing this? Were you doing it by hand? Use of any of the freely available ballistic calulators would have done the same in 10 seconds.



Yeah, 2 hours. Most of that time was checking various websites for muzzle velocity, then estimating height-over-bore, then doodling around with my target template in Word, etc etc.

Perhaps what I should have said was I spent 2 hours from starting the calcs to ending up with a finished target to my wishes. YMMV :)

I'll try that 12-15, this ACOG's got 1/3 minute clicks.
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