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Sightron SIII 6x24x50 LR MOA-2 - reticle question

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2015 at 15:51
Fat Dave View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: June/14/2015
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Hi guys,

After reading up on the Sightron scopes I finally got my pennies together and purchased a Sightron SIII 6x24x50 (SFP) LR MOA-2 to mount onto my Remington 788 in .308 win.

The rifle is zeroed for 200 metres firing a 150 grain SST @2600 ft/s.

I'll make it clear up front - maths is not my strong point :) so I'm looking to see if anyone can help explain how the MOA-2 reticle works.

If my target is at distance and given enough time - I plan to use the turrets and simply dial-up the required MOA. However, should the situation not allow for this, I'd like to be able to use the reticles so I could select the appropriate hold-over. 

According to the data tables that came with the scope, at max power (24x) the MOA distance of one reticle spacing is 2 MOA @ 100 yards.

Seeing I would only be using this maximum magnification setting at long range (say anything over 400 meters), I am trying to figure out how much MOA each one of these spacing equates too at different magnifications/distances.

Here is my mathematical problem - and apologies up front for what is coming:

Say my target is at 300 metres, and I have the scope set at 9x. The rifle is zeroed at 200 metres. Sightron's data tables tell me at 9x the MOA distance of one spacing is 5.3 at 100 yards.

Now I believe 1 MOA at 100 metres is roughly 3cm, so at 300 metres 1 MOA would be @ 9cm.

Does this mean that at 300 metres - and using 9x- one of these spacings equates to 5.3 MOA x 3 (for the 300 metre distance) = 15.9 MOA or @ 143 cms!?

Any help in explaining how this reticle works would be greatly appreciated. 

Cheers

David
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/19/2015 at 19:23
Fat Dave View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: June/14/2015
Location: N.Z
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Stand down Gentleman...Smile

I have been informed that distance has nothing to do with it. 

"At 24 power yes it's 2 moa. But it's 2 moa at 100 or 300 or whatever".

This answers my question really.

Unless anyone else has a different opinion, I can put this one to bed.

Cheers guys

David

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/20/2015 at 15:30
csc57 View Drop Down
Optics GrassHopper
Optics GrassHopper


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You should have recieved a reticle sheet when you purchase your scope that has the reticle MOA for each power.  I have mine from my STAC which is MOA - 3 reticle and my Siii 10-50 which is the MOA -2 reticle. Here are the MOA readings by power for your reticle.  You will need to look in Row E to find out the distance between each hash.

http://s1200.photobucket.com/user/cscollis/media/Capture.jpg.html?sort=3&o=0
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/20/2015 at 15:42
csc57 View Drop Down
Optics GrassHopper
Optics GrassHopper


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 photo Capture.jpg
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/20/2015 at 19:46
Fat Dave View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: June/14/2015
Location: N.Z
Status: Offline
Points: 12
Thanks for the reply csc57,

What confused me initially was the 'valid at 100 yards' statement. I thought that meant that at 2-3 or 400 yards I needed to multiply - like one does when dialling up - to get the correct MOA.

I get it now :)

Appreciate your effort in getting the data-sheet posted up here too.

Cheers

David

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