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Testing scope tracking and subtensions

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Testing scope tracking and subtensions

Postby practice-more » Thu Dec 08, 2016 3:39 pm

I have access to a CAD system and I made a MOA chart to use for testing a new rifle scope.

The chart has a 1 MOA grid (drawn at the actual 1.047") and is set to test the tracing from center, around an 8 MOA box, and back to center.

However, I see that I can't post a PDF attachment. I will try to convert it to JPG and see if that works. It would be printable at 100% on an 11x17.

Mitch
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Re: Testing scope tracking and subtensions

Postby Fitter » Thu Dec 08, 2016 7:03 pm

Testing. I hadn't realized pdf files were not allowed. I've enabled the option with a 5 mb limit and am testing.

fur_harvester_seasons_bag_limits_515153_7.pdf
(96.04 KiB) Downloaded 68 times
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Re: Testing scope tracking and subtensions

Postby Fitter » Thu Dec 08, 2016 7:04 pm

Winner winner chicken dinner.

Will that file size of 5 mb's be large enough?
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Re: Testing scope tracking and subtensions

Postby practice-more » Thu Dec 08, 2016 7:25 pm

Thanks Fitter. I don't always do well with the computer lingo, but I think it is .065 megabites. :?

Here is the file. It would need to be printed at 100% on 11x17 to be accurate. If anyone has any questions, please feel free to ask.

The idea is, once you are sighted in at 100 yards, hang this target and make sure it is vertical and always aim at the middle.

-shoot 2 shots, they should hit the middle
-adjust the scope to the left 4 moa and up 4 moa
-shoot 2 shots, they should land in the upper left circle. (remember, aim at the middle still)
-adjust the scope to the right 8 moa
-shoot 2 shots
-adjust the scope down 8 moa
-shoot 2 shots
-adjust the scope to the left 8 moa
-shoot 2 shots
-adjust the scope up 4 moa and to the right 4 moa.
-shoot 2 shots, they should land back in the middle with the very first two.

You can also use the hash marks to check how true any hold over or windage marks in your scope are.

If you are a set it and forget it kind of shooter, this isn't necessary.

However, if you want to use any hold over marks, or dial your turrets in for longer range shooting, it is important that you know that your scope tracks correctly.

Mitch
Attachments
MOA Chart.pdf
(64.91 KiB) Downloaded 58 times
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Re: Testing scope tracking and subtensions

Postby Fitter » Thu Dec 08, 2016 9:32 pm

Cool!

The pdf file is 65 kilobytes.

Roughly speaking - 1,000 kilobytes makes 1 megabyte. 1,000 megabytes equals 1 gigabyte.

My nerd is showing :|
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Re: Testing scope tracking and subtensions

Postby practice-more » Fri Dec 09, 2016 8:49 am

You lost me after "roughly speaking"

Another scope verification is the "tall target test" but all you need for that is a vertical line with an aiming point at the bottom.

I will likely be doing both types of tests on a new Vortex Viper HS-T that I have. I need to finish load development on the gun first, and then I will post my scope test results.

I've been happy with the other Vortex products I have, but with the intended use of this gun, it will be critical that the tracking is repeatable. I can live with a percent error, as it can be accounted for, but it must be a constant.

Mitch
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Re: Testing scope tracking and subtensions

Postby practice-more » Sat Dec 10, 2016 7:17 pm

Since I have access to a large format printer, I made another version that goes out farther in each direction and printed it on 24x36.

I also incorporate a means of doing a tall target test by putting an additional aiming dot down 12 moa from the center. This allows for an "up 10" and "up 20" to be verified.

If anyone wants the larger format version just let me know and I can get a copy to you.

I had a chance to use the target today and it worked great. Here is a photo of the target. I will be doing an analysis of the shots on a review of the scope in a separate thread.

Mitch
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Tall and Box Target.jpg
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