“5 Times Better”

There are two methods that statisticians use to evaluate the reliability of E-Targets. The published report used the Radial Error as it’s main criteria.

Rattlesnake Test

The Radial method measures from the XY coordinates to center.

The other method uses Gross Error. That measures the Actual vrs the Reported XY coordinates.

THE QUESTION IS:

DOES MY E-TARGET QUALIFY FOR NRA MATCHES 2020?

Download the 1 page summary of all statistics below. Click on.

Better Buy

RADIAL ERROR reporting STANDARD DEVIATION

YardageHEXTA SDSOLO SDHEXTA Better by
600.0730.1992.7
8000.0660.6339.6
10000.0920.5105.5

RADIAL ERROR AVERAGE

Radial Error is an error calculation measuring the target center to the XY coordinate for both Actual and Reported.
YardageHEXTASOLOHEXTA better by
6000.0620.2484 times
8000.0570.4297.5 times
10000.0830.6187.4 times

Shots Passing NRA .25" Rule

The NRA has in place a rule that requires E-Targets to provide 0.25 inches accuracy for record keeping purposes.
The percentage of shots meeting current NRA Certification Standard.

The method which is employed in the report calculates the error between the ET reported shot position and the measured paper position (see picture) as 0 (zero), while the actual error is 3.2 feet.  If this method were to be adopted by the NRA for approval, then any target system with such errors would be approved for competition which is obviously not acceptable.

Another system used by the teams in Australia and which Hex Systems is based on Gross Error. That evaluates the Actual X&Y coordinates vrs the Reported X&Y coordinates.

The following tables are supplemental to the USA report.

GROSS ERROR Analysis

YardageHEXTA %SOLO %HEXTA BETTER X TimesHEXTA Max Err. InchSOLO Max ErrorHEXTA Better by
60094.4% (34 of 36)33% (12 of 36)2.8 Times0.2661.1894.47 Times
80095.0% (19 of 20)20% (4 of 20)4.75 Times0.3387.52.9198.64 Times
100088% (22 of 25)4% (1 of 25)22 Times0.4441.9724.44 Times

Here is the FOUNDATIONAL HEART of ALL E-Targets!

The acoustic center must remain stationary at all times after CALIBRATION!

Because it is almost impossible to superimpose the aiming mark center over the acoustic center to 0.1 mm, so the math calculates the OFFSET. The table below demonstrates the OFFSET movement in the Rattlesnake test.

Offset Inches

YardageHEXTA XHEXTA YSOLO XSOLO Y
6000.172.15-0.12-0.05
800-0.182.131.12-0.25
1000-0.142.182.09-0.72
STDV0.1920.0261.1060.344