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Joined: May 2002
Posts: 10,596
Campfire Outfitter
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OP
Campfire Outfitter
Joined: May 2002
Posts: 10,596 |
I know that with iron sights and a sight radius of 36", movement of the rear sight gives a one MOA change for each .010" of sight movement. I know that isn't mathematically precise, but close enough.
So with a scoped rifle and sight base spacing of 6", would you get one MOA of change for each .001" of shim?
If I'm wrong, what would each .001" of shim produce in MOA?
Paul
Stupidity has its way, while its cousin, evil, runs rampant.
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Joined: Jun 2004
Posts: 44,804
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,804 |
You can do this for whatever spacing and shim with a scientific calculator.
Make sure the calculator is in degree mode.
MOA = arctan(shim amount / spacing) x 60
For example, .001 shim over 6" spacing gives us arctan(.001/60) = .00955 degrees. This times 60, for sixty minutes per degree, gives .573 minutes of angle.
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Joined: Feb 2007
Posts: 310
Campfire Member
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Campfire Member
Joined: Feb 2007
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Know why your called mathman now.
That made my head hurt.
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Joined: Jul 2012
Posts: 2,582
Campfire Regular
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Campfire Regular
Joined: Jul 2012
Posts: 2,582 |
There's another, perhaps simpler calculation. 6" goes into 100 yards 600 times, so a deflection of 0.001" over 6" should give rise to a deflection of 0.001 x 600 = 0.6" at 100 yards.
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Joined: Feb 2005
Posts: 4,646
Campfire Tracker
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Campfire Tracker
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Posts: 4,646 |
Know why your called mathman now.
That made my head hurt. Mine too! And I was good at math in school (but that was a long time ago)
Some is Good---More is Better----Too Much is Just Right
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