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Thread: Whats your Red Dot Zero? 25-50-100 yrds?

  1. #41
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    50 yd Zero at 25 and 100 yd POI and POA Difs

    Thanks, Molon.

    That's just about what I figured from your graphs. I'm guessing that I'll bounce between the two ranges as I'm working it in. I'll be zeroing an Aimpoint CompML3 with 2 MOA dot on a Stag Arms Model 2T.

    Unfortunately, my range has a dip between the 100 yard firing point and the butts, so I can't actually fire at 50 yards. But I don't anticipate any problems using off-set POAs and POIs. (Actually sounds like a fun challenge.)

    Great info, BTW, which dovetails nicely with the LTC Santos thread on Improved Battle Sight Zero in the Optics & Mounts Sub-Forum. (Which, since it deals with iron sights seems to be misplaced, but easy to find with the sticky.)

    Take care and good shooting,
    Mike

  2. #42
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    For those of you contemplating changing around your weapons zero based strictly off of the posted charts, (which by the way are indeed an excellent reference to have on hand), read this article by Paul Howe on his preferred BZO procedures: http://www.combatshootingandtactics....llpictures.pdf I think it has ALOT of merit.

    Both the 50 & 100yd zero's are equally useful zeroing methods. I just prefer the 100yd zero because even though it drops off more @ 200yds+, it has a flatter trajectory for the distances I am more likely to encounter (0-150yds), and is still very useful out to 300yds, as long as you know your hold-offs.
    Last edited by nickdrak; 07-22-09 at 22:28.

  3. #43
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    Molon,

    Do you have a chart like the one below showing only the 100yd zero that you can post for me?


    Quote Originally Posted by Molon View Post



  4. #44
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    Very informative thread.

  5. #45
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    Question

    Quote Originally Posted by Molon View Post
    Quick question Molon, are those trajectories constant with all bullet weights?

    Given the same type and weight of the round of ammo being fired, the graph looks GTG. But what about 55 vs 62 vs 75 grain shot with the same zero? It appears in my mind, there may be some variance in trajectory based on velocity, bullet weight and powder charge. I've zeroed at 50 and 100 yards, using different bullet weights, checking accuracy and shot groups, between different ammo manufacturers. I've always had to fine tune my zero to get the same POA/POI as I switched from one bullet weight to the others.
    Last edited by RogerinTPA; 07-22-09 at 14:17.
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  6. #46
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    Quote Originally Posted by decodeddiesel View Post
    While I agree whole heartily that 50 yards is the ideal zero if your red dot sight is your primary optic, I do not think this is the answer for the OP.

    My understanding from his post is that he is running an ACOG with a backup RDS, such as this:

    He also mentioned his Comp M4, and couched his question in terms of that particular device. For the piggyback RDS, I agree completely, but I don't think he was referring to that.

    I did notice, however, that he said his ACOG is zeroed @ 100yd. If it's actually a crosshair reticle as stated, no sweat. If it's a BDC reticle, it's meant to be zeroed @100m, which is just over 109 yards, so the whole BDC would be off.
    Contractor scum, AAV

  7. #47
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    Quote Originally Posted by decodeddiesel View Post
    In which case the height over bore of the optic dictates that all of the graphs presented in this thread are not applicable to his set-up.

    I still stand by my original post that he should zero his RDS at 25 meters (or less) and even then he is going to have to become very familiar with the hold over and chin weld required to use an optic like this.
    Diesels cookin' with gas for the OP

    I think everyone is so self-centered they were concentrating on their zero . This is a great general zero thread, there are a few threads out there, but this is the best I've seen.
    Last edited by FromMyColdDeadHand; 07-22-09 at 14:38.
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  8. #48
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    Quote Originally Posted by FromMyColdDeadHand View Post
    Diesels cookin' with gas for the OP

    I think everyone is so self-centered they were concentrating on their zero .
    well, the OP did ask "what is your Red Dot Zero, & why?", not "what zero do you recommend for my setup?"

  9. #49
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    Quote Originally Posted by Riverine View Post
    He also mentioned his Comp M4, and couched his question in terms of that particular device. For the piggyback RDS, I agree completely, but I don't think he was referring to that.
    I re-read the post and I agree with you, though it is written in such a manor as to be ambiguous, at least to me.

    I did notice, however, that he said his ACOG is zeroed @ 100yd. If it's actually a crosshair reticle as stated, no sweat. If it's a BDC reticle, it's meant to be zeroed @100m, which is just over 109 yards, so the whole BDC would be off.
    Noticed that too. I wonder if he zero'd with M855 (and the correct barrel length ) as per Trijicon's recommendations.

    I don't really know how big of a difference it would make.

  10. #50
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    I've used the 100 yd zero for 6 years now, mostly because when I came to my dept thats what they were using and they used locktite to prevent sights from being manipulated. I tried the 50 meter once but I was so used to the 100 yd it was taking forever to get my shots right in close. I switched back...

    I use the same rifle for patrol and SWAT. Yesterday my Team focused on accuracy drills from 50-400 yards and I made hits on a center-mass sized steel jake from all distances with the Eotech 512 by holding the reticle on the center of the target. By the time your so far back you have to hold over your target you can barely see it anyway. Hell I could barely see it at 400!

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