velocity reading

[baredog]

probably dumb question but if my 300 yd range has shot maker velocity at 300 yards do i just use a ballistic calculator with 300 yard velocity info to get velocity at muzzle....thanks in advance.

 

[Pres100]

I think it's been said a number of times that there is a lot of variability in the accuracy of those numbers and it can be used as a guideline but may not be accurate enough for ballistic computing.... had to do with the proximity of the acoustic microphones, moving targets, etc. Adam from shotmarker concurred.

This is my recollection of reading prior posts about the subject.

 

[baredog]

thank you appreciate the response

 

[baredog]

did find those prior posts that answered question

 

[Ned Ludd]

Electronic targets such as the Shotmarker can give decent velocity readings at the target face. They can also generate values that are way off. Unfortunately, the user may not have a good way to tell whether the value is good or bad.

An alternative method would be to input the bullet BC and the pertinent atmospheric values into a ballistic calculator such as JBM Ballistics:

JBM - Calculations - Trajectory (Simplified)

www.jbmballistics.com

Make a guess at the velocity initially, then fine-tune it until the predicted drop from, let's say, 100 to 300 yd, is exactly what you have observed from your scope elevation turret settings when shooting at the two distances. This is not a "perfect" method either, but at least it has a different set of caveats than using an e-target velocity of which you are unsure.

 

[Pres100]

this is an example of some testing I did about 2 years ago that looked like it mirrored velocities fairly well with the chronograph.