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Reloading Berger Bullets


Duplicate Chronograph results

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Unread 06-15-2012, 11:14 AM
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Join Date: Apr 2010
Location: Allen, TX
Posts: 2,608
Re: Duplicate Chronograph results

Originally Posted by MNbogboy View Post
[...]Somebody else said that if the OP had results like he said it could be very well that he did everything right...I agree...

And, cold bore hits with lots of tight groups at long ranges under varying conditions will certainly validate that.

-- richard
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Unread 06-15-2012, 01:48 PM
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Join Date: Jul 2009
Location: Northern MN
Posts: 236
Re: Duplicate Chronograph results

Exactly, Richard....No matter how good the OCW testing is only validation with long range field testing will prove it...It will prove the grouping and the drop test will verify any chrono error...
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Unread 10-20-2012, 03:19 AM
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Join Date: Dec 2006
Posts: 32
Re: Duplicate Chronograph results

I read all this thread and never saw real resolution to the OP's question. Just yesterday I wrote to and received replies from Competition Electronics which made sense. I was asking why I got identical numbers displayed (like 3122 but never a 3123) and why I got the "duplicate" reading semi-frequently. Rather than put my twist on it, here is the quote from Jim at CE:
"Depending upon what velocity you are measuring, there is a "gap" between displayed readings. Above 1,500FPS the unit will begin incrementing by 2FPS.

The "gap" between velocity readings increases with speed. For instance, at 3,000FPS the chronograph has a gap of 6-7FPS for each count of the internal clock. So if you are getting duplicates at 3,000FPS then your loads are likely within +/- 7FPS of each other. Part of this is due to "rounding of the internal calculations. This translates to about a maximum of .2% error which is part of our 1% accuracy spec."
I put into bold the eye-opener for me. A dup message and reading are within a tolerance range. It also means to me that ES and SD numbers are only within a range as well, so strings should be long if the ES and SD are to be meaningful.
I chased shooting forums looking for similar posts, and never saw this information displayed! Hope it helps somebody before they loose all their hair over it....too late for me!
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