Testing the Chrony

[dthunter]

One way you can check your chrony is to measure your drops at various ranges.
Between the chronies value, and your measured drop values, you can prove your chrony.
The longer distances seem to give me a better idea.

Try it, compare actual drop, to the drop given by the chronys ave vel.

Hope I said that clear enough not to confuse anyone.

 

[Powderfinger61]

i was hoping this would stay on track about testing the chronograph, but as with most threads it became a, typical

oh well, on to EE for some humor

 

[rnbra-shooter]

@dthunter, measuring drops at various ranges is a difficult and fairly inaccurate way to check the calibration of a chronograph. To back-calculate muzzle velocity from some measured drop figures is pretty sensitive to a variety of different errors (your group size at longer range, the actual distances you are shooting at, the actual values of the scope's adjustment, actual air density)

I have done two different "sanity checks" on my Shooting Chrony:

1 - bring a .22 rifle and shoot a few rounds of known ammo over the chrony. Ideally, use high quality match ammo (because it is fairly consistent, velocity-wise). The ammo should be from a large lot (i.e. you have a large supply and you always use your test ammo from the same batch).

2 - set up a second chrono so that your speeds are being measured by two chronos.

 

[dthunter]

Mbra-shooter:

I aggree that there is room for error in the method I mentioned.
I have addressed all the things you mentioned. Becomes a little labour intensive.
It has worked for me though. Definitively. But it certainly isnt the best way for sure.

Some times I will try to do some things the hard way, just to see if I can get the results i am looking for.

I have typically done the .22rimfire match ammo check. Probably the most convienient.

Have fun and straight shoot'in guys!