New Posts New Posts RSS Feed - Accurate reading issues with Chrony
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

Accurate reading issues with Chrony

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/19/2010 at 09:13
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
Avatar
Lord Of The Flies

Joined: March/14/2007
Location: South Africa
Status: Offline
Points: 5754
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
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/19/2010 at 09:18
SVT_Tactical View Drop Down
Optics Retard
Optics Retard
Avatar
Chief Sackscratch

Joined: December/17/2009
Location: NorthCackalacky
Status: Offline
Points: 28758
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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/19/2010 at 09:38
supertool73 View Drop Down
Optics Jedi Master
Optics Jedi Master
Avatar
Superstool

Joined: January/03/2008
Location: Utah
Status: Online
Points: 9531
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.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/19/2010 at 11:06
300S&W View Drop Down
Optics God
Optics God
Avatar

Joined: January/27/2008
Location: Burlington,WV
Status: Offline
Points: 10592
  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.
  
 
   
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 08:00
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
Avatar
Lord Of The Flies

Joined: March/14/2007
Location: South Africa
Status: Offline
Points: 5754
Thanks for the feedback.
That gives me some insight as to what I found.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 08:03
300S&W View Drop Down
Optics God
Optics God
Avatar

Joined: January/27/2008
Location: Burlington,WV
Status: Offline
Points: 10592
  Thunbs Up!!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 08:33
trigger29 View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar
X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

Joined: September/29/2007
Location: South Dakota
Status: Offline
Points: 4295
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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 08:46
300S&W View Drop Down
Optics God
Optics God
Avatar

Joined: January/27/2008
Location: Burlington,WV
Status: Offline
Points: 10592
  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.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 09:21
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
Avatar
Lord Of The Flies

Joined: March/14/2007
Location: South Africa
Status: Offline
Points: 5754
I spoke to some-one this end who stated that Chrony's are prone to reading errors.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 09:43
300S&W View Drop Down
Optics God
Optics God
Avatar

Joined: January/27/2008
Location: Burlington,WV
Status: Offline
Points: 10592
  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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 09:53
Roy Finn View Drop Down
MODERATOR
MODERATOR
Avatar
Steiner Junkie

Joined: April/05/2004
Location: United States
Status: Offline
Points: 4856
The problems with my Chrony started after I sent a 180 grainer through it from my 06.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 09:56
SVT_Tactical View Drop Down
Optics Retard
Optics Retard
Avatar
Chief Sackscratch

Joined: December/17/2009
Location: NorthCackalacky
Status: Offline
Points: 28758
That tends to gieve problems to whatever it goes through Roy. lol
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2010 at 09:58
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
Avatar
Lord Of The Flies

Joined: March/14/2007
Location: South Africa
Status: Offline
Points: 5754
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!!!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2010 at 17:16
little cleo View Drop Down
Optics Apprentice
Optics Apprentice


Joined: March/23/2010
Status: Offline
Points: 140
Do you need to shoot more than one round thru it to get a accurate reading?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2010 at 17:49
300S&W View Drop Down
Optics God
Optics God
Avatar

Joined: January/27/2008
Location: Burlington,WV
Status: Offline
Points: 10592
  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.   
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2010 at 17:51
Roy Finn View Drop Down
MODERATOR
MODERATOR
Avatar
Steiner Junkie

Joined: April/05/2004
Location: United States
Status: Offline
Points: 4856
Originally posted by little cleo little cleo wrote:

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


Nobody likes a little wise arse..................................grin
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2010 at 17:53
Roy Finn View Drop Down
MODERATOR
MODERATOR
Avatar
Steiner Junkie

Joined: April/05/2004
Location: United States
Status: Offline
Points: 4856
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.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/22/2010 at 18:01
300S&W View Drop Down
Optics God
Optics God
Avatar

Joined: January/27/2008
Location: Burlington,WV
Status: Offline
Points: 10592
  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'.
 
   Yea,I've heard nothing but GOOD about'em. 


Edited by 300S&W - April/22/2010 at 18:03
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "Accurate reading issues with Chrony"
Subject Author Forum Replies Last Post
Chronograph?? cheaptrick Reloading & Ballistics 14 4/10/2007 6:52:54 PM
Very accurate digi- scale- .02grain Alan Robertson Reloading & Ballistics 38
Most accurate 25-06 stilhuntin Firearms 28
Accurate 4064 for .308? garyalarson Reloading & Ballistics 11
Zen-Ray ED2 8x43 diopter issue wadeocu Binoculars 5
Savage 6mm BR Norma issues JLud Firearms 0
Interesting read helo18 Tactical Scopes 7
1-4 scope/barrel issue chase102798 Tactical Scopes 5
Leupold VX-6 Firedot issue dw0229 Rifle Scopes 5
Scope consistency issue sdjnwest Tactical Scopes 21


This page was generated in 0.406 seconds.