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CHrono Woes

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  #1  
Unread 11-11-2006, 11:05 AM
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Join Date: Jan 2004
Location: So. IN
Posts: 174
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  
    Unread 11-12-2006, 08:46 AM
    Gold Member
     
    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  
    Unread 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  
    Unread 11-18-2006, 01:25 PM
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    Join Date: Oct 2006
    Posts: 870
    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  
    Unread 11-19-2006, 01:02 AM
    Platinum Member
     
    Join Date: Aug 2003
    Location: NC, oceanfront
    Posts: 4,056
    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  
    Unread 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  
    Unread 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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