Data Book and Charts - Dope - Wind Rose - Weaponized Math - MOA to Mil - Jack Master

Jack Master

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Anyone interested in a Mover speed and Lead charts?

Here are my charts to measure the mover speed and what to hold for speed at distance. The mover speed chart can be used for any mover/rifle. The lead chart is rifle specific and based on time of flight. IF things are moving faster than 5mph you'll have to do multiples of a number.

Mover Speed.JPG Mover hold.JPG
 

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Jack Master

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How do you have a paper chart for Density Altitude (DA) changes in your dope? Do any of you have a DA sheet in your Data Book?

I have read and been told to have drop charts for every 2000DA change. My home range is usually around 2000DA. This means I need a drop chart for -2000ft, 0ft, 2000ft, 4000ft, 6000ft, 8000ft, 10,000ft. That's 7 pages in a dope book for one rifle. I don't really want to have that many pages for one rifle (yes, I want ONE data Book for all my rifles). With 3 rifles is 21 pages to sift through. So... below is the chart I made for changing DA. Now I have 2 pages, my Home range dope chart with the wind information on the back and a DA dope chart.

Things to Note
  1. Data recorded - at the top of the chart is how I got the DA numbers. This way I can reference how temperature might change the DA as well as the station pressure. (note the comment in the margin about how temp change = DA change)
  2. All of these are at 50% humidity. To keep this simple I had to eliminate a variable, humidity was it. While I think it will effect things more after 1000yds I don't think it has enough variance inside 1000 to worry about.
  3. Wind - The wind row has 2 numbers in it. The 2 numbers are the wind speeds that are equivalent to the wind hold for 2000DA. Example - if I'm shooting at 6000DA, 800 yards - a 7mph hold is 0.9 mils (6mph from 2000DA) and a 12mph hold is 1.6mil (10mph hold for 2000DA) this allowed the chart to re-use 2 columns of information for each DA change and for me to know what my Rifle MPH is at each DA.
  4. After doing this I think the chart will work out to 1000 or 1100 yards. After that a more refined DA chart may be warranted. At 1100 yards jumping 2000DA is a 0.4 mil jump, that's about 16" of change. For an accurate shot I recommend consulting your Ballistic program on the longer shots with changing DA, but these values will at least give you a starting point if you don't have any other information. of you'll need to pin down your true DA and guess between numbers if needed.
  5. I presented this chart in 2 ways. 1st - straight data. 2nd is the plus or minus from the home range value. Doing the 2nd version can help us understand how much DA can really effect our dope. The 2nd if more for informational used and not necessarily something I would have in my data book.

Let me know what you think.

1st chart Raw DA values
Tikka 6.5 Creed HL 130ELD 2019-10-17 Density Altitude 1.jpg

2nd chart - Difference in DA from my home range.
Tikka 6.5 Creed HL 130ELD 2019-10-17 Density Altitude 2.jpg
 
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Centuriator

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Do you have versions for the various phases of the moon's effect on drop? ;)

THIS IS AWESOME...just noticed this.

Thank you very much.
 

kriller134

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How do you have a paper chart for Density Altitude (DA) changes in your dope? Do any of you have a DA sheet in your Data Book?

I have read and been told to have drop charts for every 2000DA change. My home range is usually around 2000DA. This means I need a drop chart for -2000ft, 0ft, 2000ft, 4000ft, 6000ft, 8000ft, 10,000ft. That's 7 pages in a dope book for one rifle. I don't really want to have that many pages for one rifle (yes, I want ONE data Book for all my rifles). With 3 rifles is 21 pages to sift through. So... below is the chart I made for changing DA. Now I have 2 pages, my Home range dope chart with the wind information on the back and a DA dope chart.

Things to Note
  1. Data recorded - at the top of the chart is how I got the DA numbers. This way I can reference how temperature might change the DA as well as the station pressure. (note the comment in the margin about how temp change = DA change)
  2. All of these are at 50% humidity. To keep this simple I had to eliminate a variable, humidity was it. While I think it will effect things more after 1000yds I don't think it has enough variance inside 1000 to worry about.
  3. Wind - The wind row has 2 numbers in it. The 2 numbers are the wind speeds that are equivalent to the wind hold for 2000DA. Example - if I'm shooting at 6000DA, 800 yards - a 7mph hold is 0.9 mils (6mph from 2000DA) and a 12mph hold is 1.6mil (10mph hold for 2000DA) this allowed the chart to re-use 2 columns of information for each DA change and for me to know what my Rifle MPH is at each DA.
  4. After doing this I think the chart will work out to 1000 or 1100 yards. After that a more refined DA chart may be warranted. At 1100 yards jumping 2000DA is a 0.4 mil jump, that's about 16" of change. For an accurate shot I recommend consulting your Ballistic program on the longer shots with changing DA, but these values will at least give you a starting point if you don't have any other information. of you'll need to pin down your true DA and guess between numbers if needed.
  5. I presented this chart in 2 ways. 1st - straight data. 2nd is the plus or minus from the home range value. Doing the 2nd version can help us understand how much DA can really effect our dope. The 2nd if more for informational used and not necessarily something I would have in my data book.

Let me know what you think.

1st chart Raw DA values
View attachment 7172626

2nd chart - Difference in DA from my home range.
View attachment 7172627
I’m a little confused. In the wind column, what does 5/9, 6/11...... represent? Is that wind speed or direction?
 

Jack Master

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I’m a little confused. In the wind column, what does 5/9, 6/11...... represent? Is that wind speed or direction?
Always wind speed 90 degrees to my bullet travel. Here is number 3 from the wright-up that explains what those numbers do.

Wind - The wind row has 2 numbers in it. The 2 numbers are the wind speeds that are equivalent to the wind hold for 2000DA. Example - if I'm shooting at 6000DA, 800 yards - a 7mph hold is 0.9 mils (6mph from 2000DA) and a 12mph hold is 1.6mil (10mph hold for 2000DA) this allowed the chart to re-use 2 columns of information for each DA change and for me to know what my Rifle MPH is at each DA.
 
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kriller134

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Where can I buy just an empty binder? I just want to add the pdf in thread. Also are the pdf files already scaled to fit a data book?
 

Jack Master

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Where can I buy just an empty binder? I just want to add the pdf in thread. Also are the pdf files already scaled to fit a data book?
The book cover I use is a MILITARY NOTE BOOK COVER from tactical notebook covers. I ordered a 5.5x8.5 binder from Amazon and put the two together or you could order the velcro insert that tactical notebooks carries.
MILITARY NOTE BOOK COVER from tactical notebook covers

These pages on this thread are 8 1/2 x 11 and intended to be folded in half and fit in a 5x8-ish binder I prefer to cut them out around the outline, laminate them back to back and put them in my book.

Here are some photos of my data book. @seansmd
With the wind chart on the back of each chart I can see my dope chart and the wind chart each time my book is open.
Further in the back I have paper for notes or sketching. Field charts for updating data and blank charts to right out charts if I don't have one.
I also have a milling chart laminated and instructions to program my Lisa range finder.
Book is a MILITARY NOTE BOOK COVER from tactical notebook covers
View attachment 7160736
 
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RackOpsTactical

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@Jack Master Love what you're doing this these charts. I work with data for work so I appreciate your work here. I was making my own chart based off your work in excel and noticed something that I don't understand.

the 500 Try column for 0.9 * 1.45 comes out to 1.3 the chart has it as 1.4? is this because it's more aligned to Marc's experience or your experience or some other factor i'm not understanding. because i noticed that all the way down that column it's 0.1 different than my math. the 500 true 5.0 and 5.1 try was also 0.1 shifted from the math. there's a couple others as well.

is this trued to a specific caliber or rifle, or again am i misreading this?

please don't take this as being critical, i'm trying to understand.
 

TacticalDillhole

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@Jack Master Love what you're doing this these charts. I work with data for work so I appreciate your work here. I was making my own chart based off your work in excel and noticed something that I don't understand.

the 500 Try column for 0.9 * 1.45 comes out to 1.3 the chart has it as 1.4? is this because it's more aligned to Marc's experience or your experience or some other factor i'm not understanding. because i noticed that all the way down that column it's 0.1 different than my math. the 500 true 5.0 and 5.1 try was also 0.1 shifted from the math. there's a couple others as well.

is this trued to a specific caliber or rifle, or again am i misreading this?

please don't take this as being critical, i'm trying to understand.
No it’s because at some point there is a correction and it needs to be increased ie, rounded up. For 308 it can occur at around 600 yds. In addition rounding up is better because it’s always better to miss high than low.
 

RackOpsTactical

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That's not it, I completely understand what you are saying but this is not rounding or correction. If you do it in Excel or even with just a calculator you'll see.
 

Jack Master

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@Jack Master Love what you're doing this these charts. I work with data for work so I appreciate your work here. I was making my own chart based off your work in excel and noticed something that I don't understand.

the 500 Try column for 0.9 * 1.45 comes out to 1.3 the chart has it as 1.4? is this because it's more aligned to Marc's experience or your experience or some other factor i'm not understanding. because i noticed that all the way down that column it's 0.1 different than my math. the 500 true 5.0 and 5.1 try was also 0.1 shifted from the math. there's a couple others as well.

is this trued to a specific caliber or rifle, or again am i misreading this?

please don't take this as being critical, i'm trying to understand.
Rack - I agree. I too am seeing this. Thanks for pointing it out.
After spending 30 minutes thinking Google sheets can't do math and 3 beers later I finally found what's going on. Its simple, I let the spread sheet carry the decimals in the background. See image below. When the cells are set to show one number past the decimal ya don't see the rounding going on. My sheet is built from the 1.0 Mil line (in heavy boarder) with adding, subtracting and multiplying to the end line.

My Questions will be - Does it matter? After all, this is only try dope. Several guys have used this sheet a reported back that is worked really well. We're expecting the change a 10th here and there to make perfect watermark bullet placement.

EDIT: - I did replace the sheet on the first posting with an updated weaponized math. It does not carry the decimals. This would be closer to what is calculated with a standard calculator or mental math. Still don't think it'll make much real difference.

Capture.JPG
 
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RackOpsTactical

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Rack - I agree. I too am seeing this. Thanks for pointing it out.
After spending 30 minutes thinking Google sheets can't do math and 3 beers later I finally found what's going on. Its simple, I let the spread sheet carry the decimals in the background. See image below. When the cells are set to show one number past the decimal ya don't see the rounding going on. My sheet is built from the 1.0 Mil line (in heavy boarder) with adding, subtracting and multiplying to the end line.

My Questions will be - Does it matter? After all, this is only try dope. Several guys have used this sheet a reported back that is worked really well. We're expecting the change a 10th here and there to make perfect watermark bullet placement.

EDIT: - I did replace the sheet on the first posting with an updated weaponized math. It does not carry the decimals. This would be closer to what is calculated with a standard calculator or mental math. Still don't think it'll make much real difference.

View attachment 7181834
Thanks man, I agree, I don't think it will matter much. However if we want to truly put weaponized math to the test we want it to match the training.

Again love what you did with the math visually, and such a cool concept Marc and Frank came up with!