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What do your drop charts look like?

 
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  #1  
Old 04-13-2009, 09:45 PM
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What do your drop charts look like?

Guys,

I have spent a lot of time formatting/re-formatting drop charts. Here is what I've come up with. Just thought I would share and see what others have come up with.

First of all, I use Nightforce scopes with the R1 reticle (which has 10MOA marks above the crosshair and 20moa marks below the crosshair).

I decided that instead of using a set of given yardages and listing the MOA drops, I'd use a set of given MOA's (from 10moa above to 20moa below the crosshair) and list the appropriate yardages.

I then wanted to be able to use the chart at a number of different elevations, as a single day of hunting in Southern Colorado can easily require shots from 7000ft elevation to well over 14000ft !!

Here is what I came up with. With a simple Barometric pressure gauge, I can determine which line of the drop chart to use. If the pressure is between 2 of the lines, I've found that simply estimating between the 2 lines gives me VERY close info as compared to exbal on my PC.

So far, the drop chart has worked very well. As an example, the cell that is highlighted shows that for a barometric pressure of 22 (approximately 7902ft elevation) and a range of 1240yds , I would use my 12moa below the crosshair and would allow 3.5moa for a 10mph full value wind.



Let me know what you think.

AJ
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Old 04-14-2009, 06:25 AM
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Re: What do your drop charts look like?

I use a simple laminated piece of paper with an average trajectory for where I think I will hunt. I also include Mach or velocity and TOT being as I might be tempted to take an exceptionally long shot or God send ATH to flame me but I might shoot at something on the move. At the bottom of my chart I have the conditions it was run for and the correction factor for alternative conditions. Plus a separate piece of paper for cosine corrections
This is what appears at the bottom of my 7AM chart for Idaho elk hunting.

Ele=5175, Temp = 60F

@1000 yards, +10 Degrees = 0.1 inches less drop
+1000 ft elevation = -0.2 inches less drop
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Old 04-14-2009, 11:47 AM
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Re: What do your drop charts look like?

I print mine to include the average altitude I will be hunting at as well as the average temprature. It also has equasions and constants for calculating the angle of fire correction.

This is of course as a last resort when my hand held takes a dump.

I also cut out the circle for my scope flip cover and tape the range card to my stock. All are printed on waterproof map paper so they do not need lamination.

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Last edited by Michael Eichele; 04-14-2009 at 11:50 AM.
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Old 04-15-2009, 12:33 PM
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Re: What do your drop charts look like?

AJ,
I couldn't get the pic to come up on the email you sent...but now I see!
I think you did a hell of a job on it...like you said, you think too much!
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Old 04-15-2009, 12:41 PM
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Re: What do your drop charts look like?

Quote:
Originally Posted by Bravo 4 View Post
AJ,
I couldn't get the pic to come up on the email you sent...but now I see!
I think you did a hell of a job on it...like you said, you think too much!

Yep, A couple things I failed to mention.

1) I use a PDA and this chart would only be used in the event that the PDA was not avail.
2) I wouldn't carry the entire chart, just 3 colors that are centered around the Baro pressure I expect. This makes it small enough to easily tape to the stock of the rifle.

AJ
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  #6  
Old 04-15-2009, 12:46 PM
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Re: What do your drop charts look like?

Michael,

I love your chart. I assume that is the calculator you put together?

Is there an easy way to output the data from your calculator by MOA instead of by yardage? In other words, list the drops associated with a reticle (like the NF NP-R1)? I currently have to go through all the exbal data and manually create my drop chart for each moa from -10 through +30moa.

AJ
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  #7  
Old 04-15-2009, 01:30 PM
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Re: What do your drop charts look like?

Just getting started, and that was some good info.
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