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Discussion Starter #1 (Edited)
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. :dunno

Alrighty... the results of my nerd experiment! Continued below, so the photos will post the right size...
 

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Discussion Starter #2 (Edited)
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! :grin
 

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Veddy interesting and thanks for sharing! :thumsup
 

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