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CHrono Woes

 
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  #1  
Old 11-11-2006, 11:05 AM
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Join Date: Jan 2004
Location: So. IN
Posts: 164
CHrono Woes

I am a bit confused with my new PRO Chonograph Digital. It seems to read velocitys approx 100fps slower than my Chrony F-1. (That met an untimely demise)
Here are a few velocitys that were chronred on the F-1 and the Pro Chrono.

308win- 26"bbl, 45.5gr Varget, 175VLD
F-1= 2750, PC= 2650

308win- 26"bbl, 45gr Varget, 175smk
F1=2725, PC= 2625

2-223Rem- 26"bbls, 25.5gr Benchmark, 55gr BK
F-1= 3350, PC=3250

7mmRemMag- 28"bbl, 63gr RL22, 180 VLD
F-1=2975, PC=2870

I never chronoed the load below on the F1.
300wsm- 29"bbl, 68.5 RL19, 190VLD
PC= 3000fps


I then tested a friends 308win:
24" bbl, 45gr varget, 175smk
PC=2560, I figured it should be 2650-2700.

I used the 7mmRemMag and the 308win @ 800yrds 2weeks ago and they both supported ballistic charts that I made with the data from the F-1.

Anyone had a problem like this before?
Which one should I believe? Im guessing the F-1.
Any help would be greatly appreciated.
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  #2  
Old 11-12-2006, 08:46 AM
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Join Date: Jan 2003
Location: centre,alabama
Posts: 948
Re: CHrono Woes

I have had 3 of the Chronys got rid of the 2 that gave the most vel kept the conservative one it works well with my ballistics programs. I would suggest going with the one that worked with your ball. program ,the pro Chrono would probably be more trust worthy although I haven't seen a devise to calibrate any of them with... [img]/ubbthreads/images/graemlins/wink.gif[/img]
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  #3  
Old 11-18-2006, 09:23 AM
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Join Date: Nov 2005
Location: Texas
Posts: 226
Re: CHrono Woes

Buy a Oehler
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  #4  
Old 11-18-2006, 01:25 PM
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Join Date: Oct 2006
Posts: 718
Re: CHrono Woes

Oehler is not an option anymore, thier web page says they are no longer selling personel chrono's.
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  #5  
Old 11-19-2006, 01:02 AM
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Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,211
Re: CHrono Woes

If you know someone with an Oehler, see if you can borrow it. Then calibrate yours by adjusting screen spacing.
It don't take much adjustment to be off that much.
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  #6  
Old 11-19-2006, 10:04 AM
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Join Date: Nov 2005
Location: Texas
Posts: 226
Re: CHrono Woes

[ QUOTE ]
Oehler is not an option anymore, thier web page says they are no longer selling personel chrono's.

[/ QUOTE ]
Well isn't that a crappy deal.
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  #7  
Old 11-19-2006, 06:25 PM
 
Posts: n/a
Re: CHrono Woes

[ QUOTE ]
Oehler, ... it. Then calibrate yours by adjusting screen spacing.
It don't take much adjustment to be off that much.


[/ QUOTE ]

Great idea. I'll try to talk my local club into buying one. I have two Chronys and they are very consistent. I assumed that meant they were accurate but perhaps they are just off by the same factor [img]/ubbthreads/images/graemlins/smile.gif[/img]
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