How do you evaluate precision - eTargets

[dcali]

Use a little common sense.
Even if it was a consistent .25” away from the line of the 10 ring, its still unacceptable.
We are talking accuracy here. The whole key component to ease shooters minds. It doesn’t matter if 9 shots are .25” away from actual bullet center and 1 is spot on. They ALL need to consistent.
You have a .25” circle from actual bullet center.
The current ET’s have failed at that. At least the SM’s have.

That’s kind of what I’m saying. If you have such a large error allowable, it’s not good enough to say “.25”. You need to specify what that means because there is no such thing as 100% confidence. And if you specify more that that, people will get confused and the standards won’t be enforced consistently. The only way this works is if the error is so small that nobody cares.

 

[243Mendoza]

The .250 error is a red herring. The repeatable .250 is the fact. Example the shot hole is fact, the recorded position is in the same position next to each hole .250 away maximum . Testing done here is the error is way less than .250 and repeatable at the same distance...

Can you please post the test results as was done by the Australians?

 

[Rick Ratzlaff]

Here's a library of Australian tests.

https://goballistic.us/testing/library/

And more to come.

 

[243Mendoza]

Here's a library of Australian tests.

https://goballistic.us/testing/library/

And more to come.

"Page not found" for Long Range Test of Hexta link.

 

[Bindi2]

Can you please post the test results as was done by the Australians?

This is just one series of tests. Notice the repeatability this is not random error. You must understand the difference. Random error is the target is shot out repeatability is in service. The smaller the repeatability is the accuracy after all the other range issues have been corrected.

 

[243Mendoza]

This is just one series of tests. Notice the repeatability this is not random error. You must understand the difference. Random error is the target is shot out repeatability is in service. The smaller the repeatability is the accuracy after all the other range issues have been corrected.

Thanks for the data. Following is the average and standard deviation of linear error for each test:

AVE 10.31898 .308 155gr
SD 4.467322

AVE 11.28418 .308 155gr
STD 4.817964

AVE 2.549684 .260 140gr
STD 2.999518

AVE 8.914277 .223 80gr
STD 5.827596

Not sure what is meant by repeatability of test results unless you mean the average and SD of a given caliber/bullet combination is repeatable.

 

[JohnKielly]

"Page not found" for Long Range Test of Hexta link.

Steve, worked for me.

 

[7MM-RAHM]

I’m all about the HEX system!!! Out of the E targets it has the less amount of problems!!!! A GO for Record button would be awesome though! There was not one time I have shot to the hex and questioned shot placement

 

[243Mendoza]

Steve, worked for me.

I still "Page not found" when I use https://goballistic.us/wp-content/uploads/2018/05/ALL-Cairns-Hexta-Final-Report.pdf

 

[243Mendoza]

Thanks for the data. Following is the average and standard deviation of linear error for each test (in millimeter units):

AVE 10.31898 .308 155gr
SD 4.467322

AVE 11.28418 .308 155gr
STD 4.817964

AVE 2.549684 .260 140gr
STD 2.999518

AVE 8.914277 .223 80gr
STD 5.827596

Not sure what is meant by repeatability of test results unless you mean the average and SD of a given caliber/bullet combination is repeatable.

 

[JohnKielly]

I still "Page not found" when I use https://goballistic.us/wp-content/uploads/2018/05/ALL-Cairns-Hexta-Final-Report.pdf

Sorry, my bad. I was looking at the library quoted by the other poster & assumed that yours was the same link. Now I see what the issues is.

 

[HomeSlice]

The targets can be shot out at between 300 rounds minimum to 1200 rounds maximum.

What does it mean that the targets “can be shot out”?

 

[Rick Ratzlaff]

"Page not found" for Long Range Test of Hexta link.

Thanks for the heads up. I think it's fixed.

 

[Bindi2]

Repeatability is the position of the hole to the position of the recorded hole. There is no random positions. The recorded monitor holes and the physical holes can be lined up almost 100%. The difference is what the error is . We have not found a perfect target but most are very close. The human hand is not perfect at building these frames or other equipment this is why repeatability is the key. Wooden frames warp, wind bends them, E Targets have shown up many issues because of the accuracy requirement of shooters. Manual targets are a poor bench mark but we had to start somewhere.
A shot out target is one that dose not record or randomly records because the sound chamber is beyond service. When the membrane can be seen from the front or rear or a hole right through.
When this is the case the wind affects the sound wave in the chamber and random recording occurs at first then gets to diagonal recording or nothing missed shots when in fact the target has been hit. Depending on how good the shooters are 300 rounds can be the beginning of degradation by 1200 it will be the case. The acoustic centre and the physical centre can be in two different places one is used for aiming at, the other is used for recording. If the wind pushes you out to one side you adjust your sights aim in the same place and fire the recorded hole should show the change to the sights. Don't stress about this issue just use the acoustic centre that is the recorded shot the physical overlay is a means to check the target.