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Accurate reading issues with Chrony |
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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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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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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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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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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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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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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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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"I ain't got time to bleed!"
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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Thanks for the feedback.
That gives me some insight as to what I found.
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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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!!
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"I ain't got time to bleed!"
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trigger29
Optics Master Extraordinaire X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ? Joined: September/29/2007 Location: South Dakota Status: Offline Points: 4353 |
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"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." |
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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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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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"I ain't got time to bleed!"
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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I spoke to some-one this end who stated that Chrony's are prone to reading errors.
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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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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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"I ain't got time to bleed!"
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Roy Finn
MODERATOR Steiner Junkie Joined: April/05/2004 Location: United States Status: Offline Points: 4856 |
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The problems with my Chrony started after I sent a 180 grainer through it from my 06.
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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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That tends to gieve problems to whatever it goes through Roy. lol
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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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That would definately upset the readings!!!
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little cleo
Optics Apprentice Joined: March/23/2010 Status: Offline Points: 140 |
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Do you need to shoot more than one round thru it to get a accurate reading?
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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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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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"I ain't got time to bleed!"
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Roy Finn
MODERATOR Steiner Junkie Joined: April/05/2004 Location: United States Status: Offline Points: 4856 |
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Nobody likes a little wise arse..................................grin |
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Roy Finn
MODERATOR Steiner Junkie Joined: April/05/2004 Location: United States Status: Offline Points: 4856 |
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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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300S&W
Optics God Joined: January/27/2008 Location: Burlington,WV Status: Offline Points: 10592 |
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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 |
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