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SWFA MRAD index marks

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/19/2014 at 19:52
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Optics GrassHopper
Optics GrassHopper


Joined: February/19/2014
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Why does my SWFA 10x42 MRAD scope have two sets of index marks on the elevation turret?  I would assume it would allow the knobs to make 2 full turns using the same hash mark on the turret base however that does not seem to be the case.  As an example, a full rotation of the knob moves the turret from the "7" hash mark to the "8". I just can't seem to wrap my noodle around the concept of the double index marks.  Thanks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/19/2014 at 20:40
supertool73 View Drop Down
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Superstool

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Unless your is somehow marked wromg the number above should always be 5 higher than the number below it. So above the 2 you would have a 7. One rotation is 5 mils
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/19/2014 at 21:35
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Optics GrassHopper
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You are correct, the 2 sets of elevation index marks are separated by 5 and one rotation is 5 mils.  The question that remains is why does one rotation move the turret up one hash mark (e.g. 7 to 8) on the non-rotating turret base.  The hash marks are whole numbers, in most numbering systems the whole numbers are in subdivisions of 10.  Shouldn't 2 rotations  (10 mils) cause the turret to move between the whole number hash marks?  The logic in this system escapes me.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/19/2014 at 22:36
supertool73 View Drop Down
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Its so you can keep track of how many rotations you have moved up so you can turn it back to your zero when your done with your shot.
Say you were shooting a .308 1200 yards and you needed 14.5 mils of elevation. Lets say at your zero you could see the number 2 hash mark. So you know you started at two. So you dial in 14.5 mils which is almost 3 rotations. So now you should see a 3 and a 4 and almost the 5 hash mark. So you know you dialed up 2 full rotations because you can see 3 and 4. And you know you dialed 4.5 because that is what is showing on the turret. So to get back to your zero you dial it down so you can only see the two and have your turret on the zero.

Its just for keeping track of how many rotations you have went up. Nothing more.

Edited by supertool73 - February/20/2014 at 10:43
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