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Dialing For Distance

 
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  #1  
Old 03-22-2012, 09:54 PM
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Join Date: Jan 2012
Posts: 60
Dialing For Distance

Ok,

In the past I've always used cheap scope for hunting and shooting. I'd zero them for point blank range and then just use hold overs. This has worked out well out to 300 yards or so.

Recently I bought a Viper Vortex. It has 1/4 MOA adjustments. I've never really dailed for distance before and I am a little confused. Since my scope is 1/4 MOA, I assumed that it was 1/4 inch at 100, 1/2 inch at 200, 1 inch at 400 etc .....

But, when I run my velocities for my ammo through JBM, it gives me way different numbers.

For drop in inches at 100, 200, 300 and 400 it says .....

0.0

4.3

15.8

35.9

For drop in MOA it says .......

0.0

2.1

5.0

8.6


Shouldn't these two sets of numbers be the same??

I hope someone can clear this up for me.
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  #2  
Old 03-22-2012, 10:03 PM
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Join Date: Jan 2012
Location: Hot Springs, South Dakota
Posts: 504
Re: Dialing For Distance

What is Minute of Angle

Hopefully, this helps.

But, your above numbers are about right.
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  #3  
Old 03-22-2012, 10:44 PM
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Join Date: Dec 2009
Location: NW MT
Posts: 2,558
Re: Dialing For Distance

it gave you the drop in inches and the moa correction. 1moa=4[1/4] on your scope4.3''= 2.1x2,for 200yrd.35.9'' =8.6x4 for 400 yrd drop.that should be more like 8.9
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  #4  
Old 03-23-2012, 05:41 AM
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Location: Northeast
Posts: 2,255
Re: Dialing For Distance

The numbers your calculator gave you are correct. One MOA is not equal to one inch, it is equal to 1.047". For example, your 300 yard value:

15.8"/3= 5.27, 5.27"/1.047=5MOA. This is correct.
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  #5  
Old 03-23-2012, 10:40 AM
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Location: NW MT
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Re: Dialing For Distance

Can tell Ive been shooting mil for a while
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  #6  
Old 03-23-2012, 10:48 AM
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Join Date: Mar 2008
Location: SW Idaho
Posts: 1,148
Re: Dialing For Distance

1 MOA is 1.047 of an inch so each click of a true MOA scope should be .26 of an inch. But your scope may or may not perform to those specs. Be sure to check your turrets to see how they perform. This isn't necessary for close range work but will be as you start to push the distance.

Your general statement about MOA clicks growing at distance is correct. But the ballistic calculator is telling you how many MOA you need to adjust, not how many clicks. 4 clicks = 1 MOA.

Do a search from the Google search button at the top of this page. There are a lot of good threads going into detail about this.

HTH,

Scot E.
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  #7  
Old 03-23-2012, 08:23 PM
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Join Date: Jan 2012
Posts: 60
Re: Dialing For Distance

I get it. I don't know what the hell I have been thinking. No wonder I got lost in my scope when I was at the range. Had to go back to zero at 100 yards and then work it out again to get on at 545 yards. I was thinking each click was 1/4 inch and so one. Not so. I did manage to take the info and make a drop chart for my rifle using clicks. I just multiplied the MOA measurements by four and went with that.
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