I needed a plot sheet for F-Class that was drawn to scale and had 1/8 moa grid lines to correspond to the click adjustments on my scopes. I could not find any on the web that were suitable for our NRAA targets so I made my own.
I have them available for download at http://www.safclass.com/plotsheets.html
NRAA TR target with super centre, NRAA F-Open target and ICFRA targets in both yards and metres are available. This should benefit wind coaches, beginners and me in shooting on our assortment of Aussie targets.
Plot/Sighting Sheets
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RJNEILSEN
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Nice looking plot sheets Ian.
I have also drawn some ICFRA TR plot sheets which can be downloaded from;
http://www.sumosight.com/downloads.html
Cheers,
Ryan Neilsen.
I have also drawn some ICFRA TR plot sheets which can be downloaded from;
http://www.sumosight.com/downloads.html
Cheers,
Ryan Neilsen.
RJNEILSEN wrote:Nice looking plot sheets Ian.
I have also drawn some ICFRA TR plot sheets which can be downloaded from;
http://www.sumosight.com/downloads.html
Cheers,
Ryan Neilsen.
Nice website Ryan and nice looking sight you make!
Your 300yd ICFRA plot sheet has the 3 ring drawn at over 5 moa when I calculate it to be 4.89 and I plotted it on my sheets at 5.
I know its being picky but after calculating and drawing plot sheets and yours being drawn on a much larger scale I would expect less error.
It would make bugger all difference in sighting but I havent checked all the other ring dimensions on your targets and I would like to know what the error is on your sheets? The sheets I have plotted due to the 1/8 moa grid lines and rounding have less than 1/8 moa error.
This isnt a criticism I'm just curious because when using a plot sheet as a sighting aid a correctly scaled drawing is essential. When using a plot sheet just to record data it doesnt matter at all about the accuracy of the scale.
Ian
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RJNEILSEN
- Posts: 131
- Joined: Tue Sep 08, 2009 8:17 pm
- Location: Brisbane
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IanP wrote:RJNEILSEN wrote:Nice looking plot sheets Ian.
I have also drawn some ICFRA TR plot sheets which can be downloaded from;
http://www.sumosight.com/downloads.html
Cheers,
Ryan Neilsen.
Nice website Ryan and nice looking sight you make!
Your 300yd ICFRA plot sheet has the 3 ring drawn at over 5 moa when I calculate it to be 4.89 and I plotted it on my sheets at 5.
I know its being picky but after calculating and drawing plot sheets and yours being drawn on a much larger scale I would expect less error.
It would make bugger all difference in sighting but I havent checked all the other ring dimensions on your targets and I would like to know what the error is on your sheets? The sheets I have plotted due to the 1/8 moa grid lines and rounding have less than 1/8 moa error.
This isnt a criticism I'm just curious because when using a plot sheet as a sighting aid a correctly scaled drawing is essential. When using a plot sheet just to record data it doesnt matter at all about the accuracy of the scale.
Ian
Thanks Ian, it is a valid criticism. I had a drafting error in the grid spacing. I have corrected this and have re-uploaded to my website.
I have used 1.047" per moa at each 100y. So an outer ring at 300y would be 3 x 1.047 x 25.4 = 79.7814mm diameter. If I get the ICFRA outer dimension of 560mm and divide by 79.7814mm, it gives me a touch over 7 moa. Your 300y TR plot sheet shows this ring 6.75 moa which is as you have said is 1/8moa accurate on the radius = 1/4moa on the diameter.
If I have my formulas now correct then the error I can achieve using my CAD software is only the error visible in the pen thichness in printing. But firstly I should redo these using a more accurate value for 1moa ie 1.04719".
Cheers,
Ryan.
Thanks Ian, it is a valid criticism. I had a drafting error in the grid spacing. I have corrected this and have re-uploaded to my website.
I have used 1.047" per moa at each 100y. So an outer ring at 300y would be 3 x 1.047 x 25.4 = 79.7814mm diameter. If I get the ICFRA outer dimension of 560mm and divide by 79.7814mm, it gives me a touch over 7 moa. Your 300y TR plot sheet shows this ring 6.75 moa which is as you have said is 1/8moa accurate on the radius = 1/4moa on the diameter.
If I have my formulas now correct then the error I can achieve using my CAD software is only the error visible in the pen thichness in printing. But firstly I should redo these using a more accurate value for 1moa ie 1.04719".
Cheers,
Ryan.
I used 1.0472" at 100yds for my calcs and used Excel for the different target types.
What you have said about my target plots is correct except that you have compared my TR plot to your ICFRA plot. The outer in my ICRA 300yd plot measures exactly 7 moa of angle. My given error is not based on the radius but based on the diameter of the target.
The important thing is that I applaud you making plot sheets available as a free download on your website and helping fellow shooters. Keep up the good work!
Ian
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