Come-ups in MOA


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welshgrouser
March 12, 2008, 01:11 AM
Can someone explain this to me? --- Come-ups in MOA ??

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rangerruck
March 12, 2008, 01:28 AM
Wow!!!! did you just open a can of worms. There are so many variants here, it would be one long response. So try here , and see if you can make heads or tails of this;
http://www.shooterready.com/

Zak Smith
March 12, 2008, 04:38 AM
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rangerruck
March 12, 2008, 05:36 AM
... and thanks for coming along and saving us all Zak, I knew you would have something written up, being as my first time to see it all, WOW!!! thanks a ton.

JohnMc
March 12, 2008, 08:09 AM
welshgrouser,
It's the number of clicks you need to "come up" on a scope to have your point of aim = point of impact at a longer distance than you were sighted in. This is generally defined in Minutes of Angle, which is what most scopes' adjustment knobs use as a scale. One MOA is 1/60 of a degree.

This is needed to compensate for bullet drop at longer ranges, different calibers need different come up scales. Even different loads need different scales.

http://www.lahticompany.com/things.html scroll down to "COME UPs and MOA"

sacp81170a
March 12, 2008, 10:19 AM
Just tagging for future reference.

Sunray
March 12, 2008, 10:30 AM
It's about how many clicks of elevation you need to "come up" when changing distances. Usually on a target range. For example, with an M1 rifle using M2 ammo, you need to increase your sight's elevation or "come up" 2 clicks from whatever your 100 yard mark is(that varies slightly from rifle to rifle) when moving out to 200.
It's the same idea with a hunting rifle's scope. If you need to raise the elevation by, say an inch at 100, you turn the elevation screw the number of clicks required to do so. That varies by the scope too. IE. a 1/4 minute scope needs to "come up" 4 clicks to raise the elevation one inch at 100 yards. However, most scopes on hunting rifles are sighted in high to eliminate hold over.

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