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Accurate reading issues with Chrony

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    Posted: April/19/2010 at 09:13
I borrowed a chrony for a couple of days and got all weird readings.
Bullet speed about 60ft per sec faster then expected and variations of 30 ft per second.
Got 2934 2948 2925 etc.
 
Next door a guy had a chrony set up, so I fired three rounds over that.
Got 2860, 2857 and 2858 ft per sec.
 
What gives ???
 
Are Chrony's prone to problems like this??
 
Any comments advise?
 
Both Chrony's set up as per instructions etc.


Edited by 8shots - April/19/2010 at 09:14
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SVT_Tactical Quote  Post ReplyReply Direct Link To This Post Posted: April/19/2010 at 09:18
Occationally on my chrony I will get wierd readings like that.  Each time I power completely down by taking the battery out, blow off the "eyes" with canned air and setup again.  this normally fixes it and if not I figure the lighting isn't working and wait for a sunnier day.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/19/2010 at 09:38
I put some loads together and shot them through 3 different Chronographs.  I got different readings on each one.  My personal one gave the highest speeds its a Chrony, one was about 20 diff a CED millennium and one was over 100 diff another Chrony.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: April/19/2010 at 11:06
  I've had my OLD "Shooting Chrony" since the late 80's.  Over the yrs I've found certain things to do that aren't per their instuctions as far as set up and use goes that make the readings more reliable:
 
   - I use it only on soild sky overcast days (BEST light diffuser) as shadows are any chronographs worst enemy.
   - I make sure it's opened up all the way (duh!).
   - I set it up no closer to the muzzle than 15 ft (4.57 meters). I just add 15 fps for the muzzle velocity.
   - I make sure that what ever I'm shooting through the Chrony with is as  parallel  with it as possible.
 
  Hope this helps some.
  
 
   
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8shots Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 08:00
Thanks for the feedback.
That gives me some insight as to what I found.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 08:03
  Thunbs Up!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote trigger29 Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 08:33
Originally posted by 300S&W 300S&W wrote:

  I've had my OLD "Shooting Chrony" since the late 80's.  Over the yrs I've found certain things to do that aren't per their instuctions as far as set up and use goes that make the readings more reliable:
 
   - I use it only on soild sky overcast days (BEST light diffuser) as shadows are any chronographs worst enemy.
   - I make sure it's opened up all the way (duh!).
   - I set it up no closer to the muzzle than 15 ft (4.57 meters). I just add 15 fps for the muzzle velocity.
   - I make sure that what ever I'm shooting through the Chrony with is as  parallel  with it as possible.
 
  Hope this helps some.
  
 
   
 
I concur. It's amazing how much difference the little things make.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 08:46
  YRS back I remember reading of a comparison of 3 diff chronos(an original Chrony,an Ohler of some sort,I can't rember the last one)that when set up per their instructions and under THE SAME conditions.  All readings were close enough to each other as not to matter.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8shots Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 09:21
I spoke to some-one this end who stated that Chrony's are prone to reading errors.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 09:43
  Mine's been used for yrs (firearms and archery) w/o any problems once I figured out its (and chronographs in general) short comings.  Try again and see if it helps.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Roy Finn Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 09:53
The problems with my Chrony started after I sent a 180 grainer through it from my 06.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SVT_Tactical Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 09:56
That tends to gieve problems to whatever it goes through Roy. lol
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8shots Quote  Post ReplyReply Direct Link To This Post Posted: April/20/2010 at 09:58
Originally posted by Roy Finn Roy Finn wrote:

The problems with my Chrony started after I sent a 180 grainer through it from my 06.
 
That would definately upset the readings!!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote little cleo Quote  Post ReplyReply Direct Link To This Post Posted: April/22/2010 at 17:16
Do you need to shoot more than one round thru it to get a accurate reading?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: April/22/2010 at 17:49
  If it's set up right,no. After I set mine up I shoot my .22 rimfire through it,using the same ammo every time,and see if my reading is close to what it usually is.  If it's close then I'm good to go. You can check the .22 ammo manufacturers site to get an idea of what the velocity should be.
 
  When I settle on an accurate load I've developed I'll shoot 10 rds to get an average velocity plus hope for a low velocity spread.   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Roy Finn Quote  Post ReplyReply Direct Link To This Post Posted: April/22/2010 at 17:51
Originally posted by little cleo little cleo wrote:

Do you need to shoot more than one round thru it to get a accurate reading?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Roy Finn Quote  Post ReplyReply Direct Link To This Post Posted: April/22/2010 at 17:53
Actually, I replaced my Chrony with a ProChrono and like it much better. It has a much larger shooting area. They cost about the same as well.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 300S&W Quote  Post ReplyReply Direct Link To This Post Posted: April/22/2010 at 18:01
  Had a guy show up yrs back to shoot his 7mm RM reloads through the chrono. 140gr bullets but I don't remember if he even told me the load. 2 shots read just over (READY?)3500 fps! I wanted to find out what the H*ll was going on but he couldn't get out of here fast enough with a grin that went from ear to ear. Guess he's still livin'.
 
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Edited by 300S&W - April/22/2010 at 18:03
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