More Shooting Science B****es! Are e-targets accurate?
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Thread: More Shooting Science B****es! Are e-targets accurate?

  1. #1
    Distinguished Member racer88's Avatar
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    More Shooting Science B****es! Are e-targets accurate?

    So, late last night, I was inspired to do an experiment.

    After having competed at Port Malabar with their electronic target scoring system (Silver Mountain Targets), I wondered how accurate they are.

    A paper target is mounted on the frame for aiming purposes. Scoring is done through four sensors at the corners. The shooter gets feedback via wifi and a tablet (such as iPad). It's a very cool thing to not have to have people in the "target pit" marking the target. It makes the match run more efficiently. And, it's also cool to be able to glance up at the iPad and get immediate feedback on your last shot.

    I recalled that I had taken a photo of the paper target at a match a year ago. I also had screenshots of 2 out of 3 "e-target" results. What if I superimposed the e-targets (with electronic "impacts" over the paper target (with actual bullet holes)? Would they line up??

    My old dental school buddy (and NRA "Distinguished Rifleman") told me that the system is known to cause "zero shifts." He doesn't like them, but the claim is that the system is "fair" because it affects everyone the same.

    Alrighty... the results of my nerd experiment! Continued below, so the photos will post the right size...
    Last edited by racer88; 12-29-2019 at 10:53 AM.
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  2. #2
    Distinguished Member racer88's Avatar
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    OK... here's the original paper target:



    There are 65 holes there from three stages (20 shots each + 5 sighters).

    Then I ran that through my OnTarget group calculator to mark the shots in red:



    I managed to snag e-target screenshots for two out of the three stages.



    Using photoshop, I superimposed the two e-targets over the paper target. I scaled them so the target rings matched up. I made the e-targets semi-transparent so we can see the paper target and bullet holes underneath. I don't think I got the camera squared up exactly when I shot the photo of the paper target. So, there's a tiny bit of skewing. But, pretty close. So, the target rings are lined up, but the e-target "impacts" and the bullet holes... not so much. Like, NONE of them line up / match. Hmmmm....



    Then I shifted the superimposed e-targets a bit, and VOILA! The bullet holes and e-target impacts line up pretty nicely! But, the rings are off!



    When you mount the paper target on the frame (which has the four electronic sensors mounted on the corners), they stress that you must get it centered properly. We did. I'm quite certain of that. So, this would seem to confirm my friend's comment about "zero shift."

    Here are the two images side-by-side:



    Now.... IF the shooter makes an ACCURATE correction with the two "sighter" shots before shooting for score, the system's "zero shift" shouldn't matter, right? Of course, that's assuming the shooter's fundamentals are spot on.

    Anyway... some interesting stuff, courtesy of the resident nerd here!
    Last edited by racer88; 12-29-2019 at 11:04 AM.
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    Super Moderator BeerHunter's Avatar
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    Veddy interesting and thanks for sharing!
    -BH

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  5. #4
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    Speaking of nerdy... the engineering nerd in me wants to quantify your results in terms of Error Vector Magnitude ("EVM").

    Link: https://en.wikipedia.org/wiki/Error_vector_magnitude

  6. #5
    Super Moderator BeerHunter's Avatar
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    Quote Originally Posted by Anduril View Post
    Speaking of nerdy... the engineering nerd in me wants to quantify your results in terms of Error Vector Magnitude ("EVM").

    Link: https://en.wikipedia.org/wiki/Error_vector_magnitude
    Cool, but then again I'm an engineer (Ramblin' Wreck from GA Tech, Aero '87) and former avionics technician. Most others probably think that's some pretty nerdy schiznit right there!
    -BH

    Member: Florida Carry, COTEP 766, SAF, GOA, NRA Endowment Life
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    Please consider joining NRA at www.nra.org and Florida Carry at www.floridacarry.org

    “The greatest danger to American freedom is a government that ignores the Constitution.”
    -- Thomas Jefferson, Third President of the United States

    "Those who 'abjure' violence can only do so because others are commuting violence on their behalf."
    -- George Orwell


    "The ultimate result of shielding men from folly is to fill the world with fools."
    -- Herbert Spencer

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