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Super Sniper E&W Calibration

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Category: Scopes
Forum Name: Tactical Scopes
Forum Description: Police and military tools of the trade
URL: http://www.opticstalk.com/forum_posts.asp?TID=3770
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Topic: Super Sniper E&W Calibration
Posted By: HU100
Subject: Super Sniper E&W Calibration
Date Posted: May/15/2006 at 20:13

Folks,

Using the below posted question from the Horus Vision web site, is the SS 10x42 TMOA or SMOA?  I use a 5.11 HRT watch with ballistic program and need to enter TMOA or SMOA.

Thanks

 

Question:    What is the difference between the (SMOA) Shooters Minute of Angle and (TMOA) True Minute of Angle?
 
Answer: SMOA subtends (covers) exactly 1 inch at exactly 100 yards.
TMOA subtends (covers) exactly 1 inch @ 95.5yards or 1.047 inches @ 100 yards.

There is an approximate 4.6% difference. An accuracy problem will occur if the scope you are using has the elevation and windage adjustment calibrated in TMOA and you are using a computer printout or range cards calibrated in SMOA. At ranges less than 400 yards you probably wouldn’t notice the difference in accuracy; however, at 1000 yards you would miss the target.

Note: For the rifleman using a Mil Dot scope, it is absolutely essential that you know if elevation and windage adjustments are calibrated in SMOA or TMOA.



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Replies:
Posted By: Mike McDonald
Date Posted: May/15/2006 at 20:33
the SS scopea are MOA. 

There is no such animal as shooters moa, just piss poor engineering on the adjustment threads. 

M
inute Of Angle is just that, ONE minute of angle at a given range which describes a defined unit of angular displacement over distance.

Nowhere in the engineering lexicon  is a shooter mentioned.




Posted By: HU100
Date Posted: May/16/2006 at 04:39

Thanks Mike.

 

When I asked this same question of the folks at Mueller about their TAC II, which I also have, they were very specific telling me that their TAC II is calibrated at TMOA, that is 1.047 inch at 100 yards.  The reply I got from SWFA was that the Super Sniper is a "true mil-dot".  I will have to assume that all reticles that are claimed to be "true mil-dots" are calibrated in TMOA.  As you can see from the Horus Vision post, beyond 400 yards will make a difference in POI if I am not feeding the program the correct info.  My 5.11 HRT Watch will display in TMOA, SMOA, or MILS, if I use it correctly.  The watch was designed in partnership with Horus Vision.  Maybe this problem only exists in their thoughts.  From what they say it is important to know whether a Mil-Dot scope is calibrated in TMOA or SMOA.  Maybe I am making a mountain out of a mole hill.



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Posted By: cheaptrick
Date Posted: May/16/2006 at 18:59

Well, I'm not nearly as savvy as Mike, but I can tell you that just because a scope maker says that the scope is TMOA or SMOA, the real litmus test is in actually testing each scope individually. 

My SS is damn near perfect so far!!

I have run a box test on this scope @ 100 yds and it is coming in near perfect. 



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