SCANNER THAT MEASURES GROUP SIZE?
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- Last Post 08 February 2012
Hi, I found this: http://www.ontargetshooting.com I hope that helps. PV
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Joe,
I've used this program and it works as advertized. However, it does take some practice and computer skills to get accurate and consistent results. It is much easier to store electronic files than paper targets!
Ric
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Target tool comes with RCBS Load and works well with little practice - I shoot a lot less sub 1-inch groups when measuring with Target Tool!
You can quiz Greg Mushial at GMDR.com about Target Tool
Slim
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Thanks to the responders.
I'm looking for a set of Cartesian coordinates of the bullet holes in a group. I'd like to be able to scan a target, locate hole centers myself, and get the list of coordinates from some/any datum.
EX: From an identified aiming point
Shot x” y"
1 1.234 2.345
2 1.245 2.456
3 1.123 2.567
Will either program do this? Thanks; joe b.
Do you have a CAD program? Like AutoCAD Lite?
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Joe,
I am no computer wizard. I downloaded and installed the free version of “On Target” version 1.10 and watched the demonstration video about 10 times.
I put a target in my scanner and fumbled through about 6 times till I got it right.
The free version of “On Target” does not allow you to print but allows you to save the file for later viewing. I used my digital camera to photograph the screen to show you the results. I always brag that my Colt Sauer Grand African .458 groups less than 1 inch at 50 yards. A little over 1 inch on this one! This target was shot with my cast RanchDog .460-350 gr FNGC bullets at 1700 fps at 50 yards:
The free version V1.10 is available at: http://www.ontargetshooting.com/download.html
Gary
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Joe here is the GMDR website.
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If you read the scan file into paint then you will find the coordinates in the left hand lower corner. You also can use a program like scan to Cad like http://www.scan2cad.com/ And read the coordinates. With the coordinates you can compare groups variation with the F-test look for outliers with the Grubb's test or just calculate the Mean radius.
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Bingo! I'd forgotten that Paint displayed the coordinates.
So all I need to do is put a scale into the picture, count the pixils per inch, locate the x,y 0 point and each of the centers. The rest in Excel.
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Also don't forget that the free version of the OnTarget program can't read files from the “pay” version. The pay version can read all previous versions and will get all future revisions for free.
Pete
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The best is to find someone who can write a small program that writes the coordinates directly into an excel file.
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There are a number of software applications that have been written that do just what the OP has asked. The oldest is Group Size Calculator. I even have an app on my Droid that does the measuring from a picture of the target, Target Calculator.
The scan and measure is very old stuff at this point. Tom Myers, an avid cast bullet designer and shooter, has written a number of software programs and in that I have purchased everything out there at one point or the other, his
I shoot a huge amount of ammunition each year and the TMT product has been the best and easiest to use for me.
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I took another screen shot with the On Target program. This target I had previously measured by hand. but I wanted to compare that to the results of the program:
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The purpose of the 2 15 shot groups was to find out if there was a difference between Hornady GC's and the ones I made from an AXE deodorant alu can with a Freechex II tool. Therefore the variance was compared of the 2 groups shot on the same morning. The F-test showed that the variance did not differ significantly. A look at the mean radius (figure of merit) confirms that easily. I don't use group size for this type of test. Groups can't become smaller with an increasing number of shots. Standard deviation and mean radius can become smaller with a larger number of shots. To decide if a shot is an outlier you need independent crteria. Some shooters have the tendency to declare a shot to be an outlier if it does not hit close to the others. If you call a shot before looking at the target that is OK.But afterwards this is questionable. Grubss test for outliers is an easy way to find out if a shot is an outlier or not. Joe B could you please explain why you look at 2 shot groups? Ranch Dog. Thanks for pointing out that the Precision load records program does it much faster and easier.
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