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Rifle Scopes Setting Up An EREK Knob

CSTactical

CSTactical

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    • Nov 18, 2009
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    Sacramento, CA
    www.cstactical.com
    #1
    <object width="425" height="350"> <param name="movie" value="http://www.youtube.com/v/uRruWk9eZpw"></param> <param name="wmode" value="transparent"></param> <embed src="http://www.youtube.com/v/uRruWk9eZpw" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>

    We get a lot of questions on this, so I wanted to put a video together to help.

    Thanks,

    Mike @ CST
     
    #7
    Re: Setting Up An EREK Knob

    I am looking for some clarification here....It appears to me that the EREK knob has some sort of zero stop. Is this true?

    Sorry for the rookie question, but I was just totally baffled by the video.

    Great video by the way Mike.
     
    #10
    Re: Setting Up An EREK Knob

    EXCELLENT video Mike!!!

    For those that do not have a bore sighter you can accomplish the same thing while on the range by zeroing the scope the same way you would w/ any other scope. Then by inserting the allen wrench and holding it "STILL" you can crank the knob all the way down. IF you held the wrench still the zero will not have changed.

    As Mike demonstrates you want to come up off the bottom a bit.

    From there you can fine tune the amount of elevation you are off the bottom with the wrench to set a specific zero (or zero stop).

    Mike makes an excellent point about giving the dial a half revolution and then "slipping" the turret to get a precise "ZERO". A small error at zero will multiply itself the more "clicks" you dial up.

    Remember any gear driven device will have some backlash to it so make sure that you dial elevation in one direction only. If you miss, dial back and then dial to the desired point.

    Cheers,

    Doc
     
    #16
    Re: Setting Up An EREK Knob

    John,

    You know most people would shit their pants worrying about scratching their scope wile spinning it in the rings...
    laugh.gif


    Where did you get the movie preview announcer guy? He build scopes?
     
    #20
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: USACS</div><div class="ubbcode-body">How many MILS of elevation does the EREK have in the 30mm, 34mm and 35mm tubes? Is it different? </div></div>

    I know the bigger the tube the more elevation you will have. With that said the More Magnification the scope has the less elevation it has.

    John (or some one from USO) can you let us know the amount of elevation the SN3's have with the EREK knob?

    Mike @ CST
     
    #22
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Captain Kirk</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mmedearis509</div><div class="ubbcode-body">I am looking for some clarification here....It appears to me that the EREK knob has some sort of zero stop. Is this true? </div></div>

    Yes it does </div></div>

    I thought this was only true if the scope was installed on a 20MOA down canted base?
     
    #23
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BattleAxe</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Captain Kirk</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mmedearis509</div><div class="ubbcode-body">I am looking for some clarification here....It appears to me that the EREK knob has some sort of zero stop. Is this true? </div></div>

    Yes it does </div></div>

    I thought this was only true if the scope was installed on a 20MOA down canted base? </div></div>

    You can set the 0-Stop for any base as long as you have the travel.

    Mike @ CST
     
    #24
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: shibby</div><div class="ubbcode-body">Thanks Mike. That's alot easier than trying to read the instructions </div></div>

    Ditto that! Again..thanks Mike
     
    #26
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: He_Shoot _Me</div><div class="ubbcode-body">Nice work on the vid Mike, and thanks for the updates/newsletters/sales.

    -Pat </div></div>

    Thanks for the appreciation! We work hard to keep things fun and interesting
    cool.gif


    Mike @ CST
     
    #27
    Re: Setting Up An EREK Knob

    Since I had to swap out scopes for a new rig I gave this method a try this weekend. All I can say is WTF were the USO folks thinking when they printed their included EREK instruction sheet? I remember the 1st time I adjusted my EREK I needed 4 hands, some electrical tape, and a 3rd eyeball to get the job done. This is wayyyyy simpler.
     
    #29
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SoCalPete</div><div class="ubbcode-body">I hope I can make sense of what I'm trying to say here:

    Do you center the reticle first, then set your zero, then set zero-stop?

    </div></div>
    Here's a written version of the video that I took to the range...

    1. Obtain 100 yd zero (or use a boresighter)
    2. Put Allen in EREK
    3. Hold Allen still and bottom elevation knob
    4. Raise elevation .2 mils (for a little room below zero, amount is personal preference)
    5. If it moves off zero during step 4 use allen to bring back
    6. Loosen knob cap screws and align zero with the turret hash mark
    7. Raise elevation a few mils and check alignment between elevation knob and turret hash mark. Adjust cap if needed and return to zero
     
    #31
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SoCalPete</div><div class="ubbcode-body">I hope I can make sense of what I'm trying to say here:

    Do you center the reticle first, then set your zero, then set zero-stop?

    </div></div>

    From the ones I have done I have not need to do center the reticle.

    Mike @ CST
     
    #32
    Re: Setting Up An EREK Knob

    Just wondering about centering the reticle, since if the reticle is not centered, or if after you set your 100yd zero the reticle moves off center (if windage is adjusted), wouldn't that prevent you from truly bottoming out to set zero-stop, since the erector tube would touch the side of the main tube before it hits bottom?

    I hope that made sense, just running this through my head and doesn't seem like it was a concern with this operation from other people.
     
    #33
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SoCalPete</div><div class="ubbcode-body">Just wondering about centering the reticle, since if the reticle is not centered, or if after you set your 100yd zero the reticle moves off center (if windage is adjusted), wouldn't that prevent you from truly bottoming out to set zero-stop, since the erector tube would touch the side of the main tube before it hits bottom?

    I hope that made sense, just running this through my head and doesn't seem like it was a concern with this operation from other people. </div></div>

    I see what you're saying. Yes, that's theoretically true but if you follow step 1 your reticle will be centered. But lets say your windage was slightly off, the impact would be minimal and the end result would be that you'd lose maybe .5 mil elevation travel (depending how far its off). You'd probably know this because because once centered you'd have a bit more travel below zero than just a few 10'ths of a mil.
     
    #36
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: trigger happy</div><div class="ubbcode-body">Excellent video CSTactical, I just got a USO with EREK and that helped clarify a few questions I had on setup that was confusing from the USO written directions I had. </div></div>

    Glad it was helpful!

    Mason @ CST
     
    #37
    Re: Setting Up An EREK Knob

    Mike, if you don't mind a question regarding the EREK?

    I just picked up my new SN3-TPAL today, and was using the method of loosening the two small screws on top of the EREK to put the number lines right in line with the clicks.

    My question is, I would line up the click at 5.5 mils for example, and the clicks up or down would be in line with the full mil marks, but be off from the 0.1 mil marks. Any idea how to adjust this, or just leave alone?

    FYI, I got the milestone EREK, and find the full mil mark detents pretty stiff but still manageable, but also agree with other posters from other threads that it does take a bit more effort clicking out of those full mil marks.
     
    #38
    Re: Setting Up An EREK Knob

    That is a new one to me. I have always found if dialed up form 0 half on the EREK knob and realigned on that number it was good for the most part. I may favor one side or the other but not by much. I take it your realigned the Milstone EREK this way?

    Mike @ CST
     
    #39
    Re: Setting Up An EREK Knob

    Thanks for the video. I set mine up this weekend.
    What is the purpose of the graduated scale on top of the knob? If it gets replaced with a blank cap after zeroing I assume it must only be for setting up the erek knob?
    My scope came without the blank one so I will run it with the one with the hole and scale. I may machine a small plug from hard rubber to seal the center hole from water/dirt
     
    #40
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: maccrazy2</div><div class="ubbcode-body">What is the purpose of the graduated scale on top of the knob?</div></div> It is there to help guide you to make the correct adjustments if you are not using a boresighter.

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: maccrazy2</div><div class="ubbcode-body">
    My scope came without the blank one so I will run it with the one with the hole and scale.</div></div> Call USO I'm sure they will get you one.

    Mike @ CST
     
    #41
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CSTACTICAL</div><div class="ubbcode-body"> <object width="425" height="350"> <param name="movie" value="http://www.youtube.com/v/uRruWk9eZpw"></param> <param name="wmode" value="transparent"></param> <embed src="http://www.youtube.com/v/uRruWk9eZpw" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"> </embed></object>

    We get a lot of questions on this, so I wanted to put a video together to help.

    Thanks,

    Mike @ CST</div></div>

    Great video, Mike, thanks!

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JBW#3</div><div class="ubbcode-body">We've had this one out for a while, sorry it isn't on our site yet.
    http://www.shootingvoodoo.com/index.php/videos/
    John III</div></div>

    Thanks, John, for posting those as well!
     
    #42
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CSTACTICAL</div><div class="ubbcode-body">That is a new one to me. I have always found if dialed up form 0 half on the EREK knob and realigned on that number it was good for the most part. I may favor one side or the other but not by much. I take it your realigned the Milstone EREK this way?

    Mike @ CST </div></div>

    Hi Mike, yeah I followed your alignment instructions to the "T", and the result I got was the favoring one side or the other, but by a bit more than I'd like. I will talk to USO about it; I didn't have this problem with my old 9 mil EREK without Milestone. This 11 mil EREK has more clicks but I've found that I tend to over-click a few 1/10 mils when I dial up or down from the full mil.
     
    #43
    Re: Setting Up An EREK Knob

    I followed the video when I went to the range yesterday and I had some slightly different results. I zeroed the scope, then as the video stated, stuck the allen wrench in the center hole, and held it in place as I rotated the outer knob down. However when I then shot the next round it was a good three feet low at the 100 yards that I was shooting at, I found that I had to rotate the out knob in one direction, bringing it down, and rotate the allen wrench the oposite direction to bring the impact back up.

    Any idea why this might have been? I finally got it all situated with about 2.5 mils of down elevation below my 100 yard zero.
     
    #44
    Re: Setting Up An EREK Knob

    Sounds like you skipped something and your 100 yard zero...wasn't. When you say you zeroed the scope, did you use a bore sighter or a round at 100 yards?

    Also, are you using a down-angled base?
     
    #45
    Re: Setting Up An EREK Knob

    I had a pretty good zero, within .1 mils of my POA that ensured that I was good to go before I started playing with the EREK knob.

    Yep, running a Badger 20 MOA base along with their rings.

    Everything was nice and tight as I had just reassembled the rifle from having HateCA install his brake on the barrel for me.
     
    #46
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rero360</div><div class="ubbcode-body">I had a pretty good zero, within .1 mils of my POA that ensured that I was good to go before I started playing with the EREK knob.

    Yep, running a Badger 20 MOA base along with their rings.

    Everything was nice and tight as I had just reassembled the rifle from having HateCA install his brake on the barrel for me. </div></div>

    You may want to try it using the USO procedure supplied with your scope. I may be mistaken but I think it might be possible to get a zero with the erector in different positions. To make the USO procedure practical for two-handed humans I used electrical tape to hold the elevation knob steady while turning the erector bolt. Either way...if you have that much travel below your zero, your erector is not bottomed.

    With the zero you obtained, how much elevation do you have above zero? With a 17x SN3 you should get approximately 22 mils (75 moa) of elevation if set up correctly on a 20moa base.
     
    #47
    Re: Setting Up An EREK Knob

    I have a 30mm tubed 5x25 TPAL and am currently getting 18.4 Mils of elevation above my zero. Which to be honest should be plenty for me, I would have to max the scope out and use my last mil hash as a hold over to get out to 1550 yards, getting those extra 2 mils would only give me another 50 yards, and I honestly don't see myself shooting at that distance any time soon. would love to try though.

    I'll take a look at USO's written instructions again though. Thanks for the info.
     
    #48
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rero360</div><div class="ubbcode-body">I followed the video when I went to the range yesterday and I had some slightly different results. I zeroed the scope, then as the video stated, stuck the allen wrench in the center hole, and held it in place as I rotated the outer knob down. However when I then shot the next round it was a good three feet low at the 100 yards that I was shooting at, I found that I had to rotate the out knob in one direction, bringing it down, and rotate the allen wrench the oposite direction to bring the impact back up.

    Any idea why this might have been? I finally got it all situated with about 2.5 mils of down elevation below my 100 yard zero. </div></div>

    This is a first for me. I'm not sure what happen. The step I have in the video have always worked for me in the past.

    Mike @ CST
     
    #49
    Re: Setting Up An EREK Knob

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CSTACTICAL</div><div class="ubbcode-body">This is a first for me. I'm not sure what happen. The step I have in the video have always worked for me in the past.
    Mike @ CST </div></div>
    Mike,
    What are you seeing for elevation from USO's on 20moa bases?
    And have you tried both 30 & 34mm tube versions? Any difference in elevation?
     
    #50
    Re: Setting Up An EREK Knob

    According to other users here and USO, the 34mm only increases the outer OD of the tube while keeping the same ID of the tube as the 30mm, so it should offer the same amount of erector tube travel as the 30mm. The 35mm tube however offers a bigger ID and offers more travel, and apparently you have the option of asking USO to bore the ID of the 35mm tube even bigger to offer even more erector tube travel... Crazy, but pretty cool.
    laugh.gif
     
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