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Posted: 1/15/2015 8:42:50 AM EDT
[#1]
Quote HistoryThat was my mistake, thanks for the link. In regards to your first post, how would it not screw up the BBC? |
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Posted: 1/15/2015 8:48:31 AM EDT
[#2]
Quote HistoryQuoted:
That was my mistake, thanks for the link. In regards to your first post, how would it not screw up the BBC? Quote HistoryQuoted:
That was my mistake, thanks for the link. In regards to your first post, how would it not screw up the BBC? answer is in the link 
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Posted: 1/15/2015 12:04:15 PM EDT
[#3]
Quote HistoryQuoted:
I disagree. If you're using the 300 meter post at 25 yards for zeroing, then using the tip of the chevron or horseshoe dot for engaging targets inside 300 meters, you should be basically dead on. Not inches high.... Quote HistoryQuoted:
Quoted:
Use 50. It's dead nuts on (within 2") from 30 yards to about 230 yards. A 25 yard zero will have you missing high on anything smaller than beach ball on targets over the likely ranges you'll be firing at. I disagree. If you're using the 300 meter post at 25 yards for zeroing, then using the tip of the chevron or horseshoe dot for engaging targets inside 300 meters, you should be basically dead on. Not inches high.... Running the numbers for M855 from an M4 (14.5") as the OP has now indicated he has, I get a value of 1.8" high at 300M (assuming a 25M near zero) at sea level, the higher in elevation you go the more it will be off . It's not exact, but it's less than a MOA off the point of aim at sea level (it's roughly 1 MOA high at 4500' ASL) . Move it in to 25 yards and zero with the 300M mark and the bullet will be striking 4.4" high at sea level (over 1 MOA high). Knowing the clicks are 1/4 MOA, one could zero at 25 yards then adjust down 6 clicks you'd be pretty close to a perfect 300m zero. You'd still need to check it on a range in case things aren't exact (like click adjustments and/or squareness of all receiver, barrel, and mount). |
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Posted: 1/15/2015 12:12:12 PM EDT
[#4]
Quote HistoryQuoted:
Holy shit people, how hard is it to figure out what the OP is trying to do. He ONLY HAS ACCESS TO A 25YARD RANGE IN THE IMMEDIATE FUTURE. NOT 36, NOT 50, NOT 100. He'd LIKE TO GET HIS ACOG set to AN APPROXIMATE 100 METER ZERO in the mean time. What mark on the reticle does he have to use to approximate a 100meter zero if he only has 25 yards to work with? Jesus fucking Christ. 
So you're saying he should zero at 100M using the 300yard post? |
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Posted: 1/15/2015 12:14:21 PM EDT
[#5]
Quote HistoryQuoted:
That was my mistake, thanks for the link. In regards to your first post, how would it not screw up the BBC? Quote HistoryQuoted:
That was my mistake, thanks for the link. In regards to your first post, how would it not screw up the BBC? You spend a lot of time thinking about that? |
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Posted: 1/15/2015 12:15:04 PM EDT
[#6]
Quoted:
Help me think this through. I'll confirm down the road when I have access to 100m, but for a basic zero, do I use the 300m mark at 25y for the zero? I do. gets me close enough that fine tuning it when i have a chance to get to a 100M range is short work. |
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Posted: 1/15/2015 12:17:47 PM EDT
[#7]
Quote HistoryThat it works better to 250-ish is true for non calibrated optics. If you have a cal'd ACOG and are using a rifle & ammo combination that matches, then it's not so true. |
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Posted: 1/15/2015 12:19:16 PM EDT
[#8]
Quote HistoryQuoted:
So you're saying he should zero at 100M using the 300yard post? Quote HistoryQuoted:
Quoted:
Holy shit people, how hard is it to figure out what the OP is trying to do. He ONLY HAS ACCESS TO A 25YARD RANGE IN THE IMMEDIATE FUTURE. NOT 36, NOT 50, NOT 100. He'd LIKE TO GET HIS ACOG set to AN APPROXIMATE 100 METER ZERO in the mean time. What mark on the reticle does he have to use to approximate a 100meter zero if he only has 25 yards to work with? Jesus fucking Christ.
So you're saying he should zero at 100M using the 300yard post? No. |
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Posted: 1/15/2015 12:32:41 PM EDT
[#9]
I was in this situation when I was in the army. Aiming at 25m using the 300m hold will get you 'close enough'. But to be dead on using a 25m silhouette zeroing target, I aim the 300m hold on the targets 'rank patch' area, and will hit dead in the center of the target. So I suppose at 25m you should hit about 1" low (as someone above said) to hit correct for the BDC at further ranges.
This is at 25m not yards though I suspect the offset would still be roughly 1" either way, and a .223 calibrated ACOG (though correct me if I'm wrong but I believe 0-300m are the same on all but the freak ACOGS like 300BLK and their crossbow variants) and assumes a 14.5 barreled flattop shooting 855. Anything else will get weird. |
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