Electronic target test report

[Mudeat]

A little calculus can some the problem of the immediate path of the bullet at the moment it passes through the target.

If someone would take the time to post the equation for wind drift, I can give it a crack - not that I'm that good at the math, but we have some people on here that can check and correct my work.

*update*
Doing a little digging and playing with JBM shows that the last yard to the target at 1000 yards has a path as follows (horizontally)

10mph std day:
30 cal 155.5 fullbore @ 2995, 30 cal 185 LRBT @ 2750, and 7mm 180 hybrid @ 2800
all had drift within .1" of one another. They averaged a path relative to the direction of fire of 19 MOA.

When I increased the wind to 30 mph, the numbers effectively tripled. The 155.5 fullbore showed a path slightly greater than 1 degree from direction of fire. The 185 and 180 hybrid weren't too far away coming in right at 1 degree and just under 1 degree respectively.

If these numbers are correct, how can we ensure that the target reports correctly in reference to the direction of the incoming shots? What if it's switchy?

Add to the that there is an additional 0.5 inch error for each 10mph of wind due to the wind shifting the sound wave off. See the Brian Litz note that says, essentially, these targets have flaws but are good enough for you.

 

[DRJR]

Steve,

Yes, indeed, .040-.080" is a very small amount, but more and more, I see matches won and lost by very small distances. At the most recent Washington State 600 yard championship, three f-open shooters cleaned the 80 shots and were separated by only 3 Xs. I don't even want to imagine how many 10s were within .080" of the X ring.

I agree on the paper targets.

Let's not go down that rabbit hole right now. Let's think about ways to either build redundency into this generation of ETs or replace them with better technology.

If ya'll would go to the Hex Systems web page and check out the technical information tab, the pages on the right hand side, and read "Acoustic chamber targets: what you need to know", "HEXTA statistical analysis and correction", and "Why four is not enough", many of your questions would be answered. It speaks to non perpendicular projectiles and the redundancy issue. It is very well written so that even a dummy like me could understand.