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Kahles CS Impact Correction

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 13:51
chuck danger View Drop Down
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I have an Kahles CS 2.5-10x50 MZ that I recently purchased.  According to the manual, the impact correction is 10mm/100m or .36/100yds.  According to their website at http://www.kahlesoptik.com/index.php5?menu=22&sprache=0&pf=4&model_id=0, the impact correction is 7mm/100m or .25/100yds.

Going with the manual, I worked out my ballistics calculations using .36/100yds-  however, when I got to the range, my corrections always came up a little short, meaning I would need to dial in a few more clicks to get the right elevation.  The leads me to suspect that the website is correct, that the correction is .25"/100yds.  I feel confident in my shooting, but I'd like to know which is correct.

Is there anyone here with the same series of scope that can confirm which is the correct number?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 14:07
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If you look back on this thread you will find some topics on the Kahles multi zero by a very knowledgeable guy on this forum ...SAKOMATO it is well explained by him. hope this helps in your situation.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 15:45
chuck danger View Drop Down
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Originally posted by rifle looney rifle looney wrote:

If you look back on this thread you will find some topics on the Kahles multi zero by a very knowledgeable guy on this forum ...SAKOMATO it is well explained by him. hope this helps in your situation.


Yeah, I read those and they *were* excellent writeups about Multizero.  My question isn't about Multizero though, which is actually pretty simple.  More about the impact correction of the Kahles CS series.  Kahles itself provides conflicting information and I just want to see what someone elses' experience has been with regards to that.



Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 16:33
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The documentation I see is that they are mil rather than MOA (so 0.36inch/click rather than 0.25inch/click.)

When you take the turret cap off, there should be some marking around the perimeter of the turret, what does it say?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 19:17
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Unfortunately (and annoyingly), there are no markings on the top turret.  The side turret says "1/4@100", but I'm guessing that maybe that just applies to left/right adjustments?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 20:31
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If it says it on the side, then it would be the same for the elevation.  It would be foolish for a manufacturer to use twu different adjustment scales.  But what do I know...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/25/2009 at 21:47
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It will have the same elevation as it has windage.

From whom did you purchase this scope?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/26/2009 at 00:03
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FWIW, I've got a Kahles 4-12X52 CL that is supposed to have 0.25 inch / 100 yard click corrections on it that I could not make work right with the ballistic calculations either.

I did some tests measuring against a yardstick at 100 yards and confirmed the actual come up on the scope is closer to 0.3 inches per click. It may not seem like much difference but it is about 20% greater than what Kahles advertises. Once I realized this, I shot the rifle and made corrections using 0.3 inches per click at 100 yards.

Once this difference was confirmed, scope elevation adjustments were very repeatable and dial ups to predict point of impact at longer distances (out to 600 yards) were straightforward.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/26/2009 at 07:46
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Many scopes have minor errors in the actual vs. stated movements; however, that is dramatic.

If it is consistent, it is serviceable, but I couldn't call it acceptable.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/26/2009 at 11:14
chuck danger View Drop Down
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Originally posted by Rancid Coolaid Rancid Coolaid wrote:

It will have the same elevation as it has windage.

From whom did you purchase this scope?


I bought it from SWFA.  I went back to the calculator and re-did the calculations for elevation based on 1/4"/100 yds and it comes out the same.  This is my first European scope so I wasn't 100% sure what those crazy Europeans might do as far as different windage/elevations... ;-)

Anyhow, I'm satisfied now that I know what the correct adjustment is.  Actually, I'm really glad its .25 and not .36 as I don't have to strain myself mathematically to adjust for .36.

Thanks all!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/26/2009 at 11:22
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Have you calculated the adjustments or have you measured the adjustments?

I measure. 

It sounds like the documentation needs updating and you are probably fine.


If it came from SWFA, it is the real deal; sometimes fakes pop up when purchased elsewhere - like ebay - and it's always helpful to answer that question early.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/26/2009 at 12:32
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Well, if I am understanding your question correctly, I calculated the adjustments and then measured them out- then tested on the range yesterday (which prompted this thread).  When adjusting for .36, I was coming up short the farther I was shooting.  Up to about 300 yards, the adjustments were pretty close.  At 400 and beyond, the adjustments started coming up really short at .36.  When I adjusted and measured for .25, things were coming out as expected.  When I started this thread, I knew the scope was adjusting at .25".  I was worried because this didn't match what the manual was telling me.  Then the Kahles website, in contradiction to the manual, confirmed my findings.  And then, when someone suggested checking the scope, it jibed with the website.

I think you are right and it's just a matter of the documentation being dated.  It was just a matter of the difference between "knowing" and *knowing*.  I like *knowing* and then seeing things work out the way I expect... :-)
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/26/2009 at 13:35
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With any scope you should preform a tracking and a reticle subtensions check.
I have several scope that say, as per thier markings or the operating manual that the adjustments are of a certain value when in actuality they were not.
 
Time to get out the tape measure and gun vise. heheheSharp Shooter
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/27/2009 at 23:30
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BTW, ten mm=.3937, an even larger difference from 1/4".
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