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losing elevation when dialing

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  #1  
Unread 09-10-2012, 12:07 PM
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Join Date: Jun 2012
Location: Kansas
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losing elevation when dialing

Recently, when shooting at 500 yards with my Millett TRS-1 4-16X atop my rem 700 .308, I noticed the rounds impacting 2.5 MOA low on a recent shoot. Iíve shot at this distance and greater several times and my data from JBM has always been dead on as far as elevation is concerned. I dialed back to my 100 yard zero and shot several rounds at 100 yards to check for a tracking issue. No issues here. The scope returned to zero almost perfectly. How did I lose 2.5 MOA in adjustment at 500 yards in just a couple weeks? Same Ammo, nearly identical weather conditions. Iím not familiar with the internal workings of the scope or how the elevation turret works. Iím hearing definitive click when I rotate the turret although it has always been a little mushy. Any ideas?
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  •   #2  
    Unread 09-10-2012, 12:30 PM
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    Join Date: Apr 2012
    Location: The cold part of Montana
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    Re: losing elevation when dialing

    which model number do you have?

    I notice something similar with my Millet scope. Mine is supposed to have 1/8min clicks but it seems more like its 1/10 min clicks. 100yrd zero equals 3moa drop at 300yrds, I have to dial up 4moa for it to be on, but using the reticle to hold the 2.5moa it subtends and my rounds hit exactly .5moa low
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      #3  
    Unread 09-10-2012, 03:36 PM
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    Re: losing elevation when dialing

    Not sure about the model number, but it does use 1/4 MOA adjustments. I'm confused because this hasn't been a consistent problem. The 1/4 MOA adjustments were right on up until just a couple weeks ago. Now i'm hitting 2.5 MOA low at 500? I'm wondering if something is slipping inside the elevation turret. I'm thinking of returning to Millett for repair if i can't diagnose the issue.
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      #4  
    Unread 09-11-2012, 08:54 AM
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    Re: losing elevation when dialing

    First off, don't just assume it is the scope. There are a lot of other variables to consider. Atmospheric conditions can make a huge difference in poi. Take it out and shoot it some more. Put some of your ammo on ice in a cooler and keep some pretty warm. Compare the drops of the two. A lot of the difference may come from temp. Humidity can also affect poi. You said it returned to zero, so it is probably not the scope. Shoot quite a bit more and see what happens.
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      #5  
    Unread 09-11-2012, 11:51 AM
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    Re: losing elevation when dialing

    Quote:
    Originally Posted by JeffP40 View Post
    First off, don't just assume it is the scope. There are a lot of other variables to consider. Atmospheric conditions can make a huge difference in poi. Take it out and shoot it some more. Put some of your ammo on ice in a cooler and keep some pretty warm. Compare the drops of the two. A lot of the difference may come from temp. Humidity can also affect poi. You said it returned to zero, so it is probably not the scope. Shoot quite a bit more and see what happens.
    Don't think so.....Lets assume for argument that he is shooting the 168 berger at 2600. You would need to drop down to under 2300 to lower impact points my 2.5 moa.

    Temp.... I max out my seirra program (130f to -30f) and am around 4 inches of change.

    There is not enough humidity on earth to make much difference at 500 yards.

    Also, if he is using a comp program to figure his come ups, he is probably already imputting the enviromental conditions.

    It is either a garbage in garbage out situation with the program or a scope issue.

    Just my .02
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      #6  
    Unread 09-11-2012, 06:59 PM
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    Re: losing elevation when dialing

    Don't forget parallax--just another part of the checklist.
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      #7  
    Unread 09-11-2012, 08:05 PM
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    Re: losing elevation when dialing

    Here's the cure: NIGHTFORCE!!
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