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Ballistic Calculator instead of Chronograph

 
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  #15  
Old 07-07-2011, 05:33 PM
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Re: Ballistic Calculator instead of Chronograph

so if chronograph is correct, then do you really think black powder musket shoots lead balls at 4000 fps?
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  #16  
Old 07-07-2011, 05:43 PM
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Re: Ballistic Calculator instead of Chronograph

No that chrono was bad. Buy a better chrono.
Actually, just assume your next slightly more expensive chrono sucks also, and buy an even better one.
Or, go ahead and buy the BEST chrono you can.
They are that important.
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  #17  
Old 07-07-2011, 05:56 PM
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Re: Ballistic Calculator instead of Chronograph

is there a way to calibrate it?
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  #18  
Old 07-07-2011, 06:15 PM
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Re: Ballistic Calculator instead of Chronograph

Quote:
Originally Posted by Jinx-) View Post
so if chronograph is correct, then do you really think black powder musket shoots lead balls at 4000 fps?
What Mikecr said. I never said all chronographs were capable of producing consistent, reliable, and credible data. Even the ones that are still have to be operated properly to get correct velocity data.
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  #19  
Old 07-07-2011, 06:26 PM
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Re: Ballistic Calculator instead of Chronograph

Quote:
Originally Posted by Jinx-) View Post
is there a way to calibrate it?
That topic is discussed in the Thread I provided the link to - above. The only way to calibrate a chronograph is to have additional chronographs or test equipment that is also capable of recording velocity, and shoot over the other equipment at the same time you shoot over your chronograph. The calibration would involve increasing or decreasing the spacing of the skyscreens until the chronograph is reading consistent with the other units.

Now if the Oehler company/folks would allow us to take our chronographs to their facility for testing along side of some of their premo units, adjustment of our skyscreens to calibrate our chronograph data to their data would be straightforward.

But chronographs come in varying quality, like every other manufactured electronic product. And even the good ones can break, malfunction, or provide some false data even when they're in tip-top shape. Which is why you need at least two units in order to identify the bad data that crops up every now and then, from the good data that is normally received with a quality chronograph that's being operated properly. My 2 cents.

Last edited by phorwath; 07-07-2011 at 07:13 PM.
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  #20  
Old 07-07-2011, 06:31 PM
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Re: Ballistic Calculator instead of Chronograph

I will read material you provided, thank you!
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  #21  
Old 07-07-2011, 10:50 PM
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Re: Ballistic Calculator instead of Chronograph

Quote:
Originally Posted by Jinx-) View Post
so if chronograph is correct, then do you really think black powder musket shoots lead balls at 4000 fps?

Obviously not.

There are several things that will give false readings of this magnitude. Muzzle blast and shock
wave from having the screens to close to the rifle.

If you research the load data the velocity should be within +or- 5 to 10% of the listed velocity.

If it is more than that you need to look at your setup and if possible compare your velocity
in another chronograph.

If your ballistic calculator tells you you need to come up 4 clicks from 100 Yards and you will be
on at 1000 yards do you believe it?

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