CED MII Chrony reading 110fps low.

CyaN1de

CyaN1de

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I had my CED Chrony out today for the first time this year.

I was shooting my 6BR over it and thought that the velocities were quite a bit lower than they should be. 30.5 grain Varget load was reading in the 2750 fps range.

A buddy of mine showed up with his chrony as well so we sat both up side by side. His showed what should have been proper velocities for the load used and mine was showing 110fps slower. He had similar loads to mine and when we shot over his chrony our numbers were very close.

I had him shoot 3 rounds over his and then a few over mine, again, his were showing around 110fps slower over my chrony.

Has anyone ever experienced this with the CED Millenium chrony's? Anyone ever dealt with their warranty dept?

I had read that they were one of the better chronographs and thats why I bought it.

It was working perfectly last year, and i even tried fresh batteries today after thinking that the battery might be low after sitting in there all winter.

I tried adjusting the chrony height and attitude but still ended up with the same results.
 
I would not automatically assume that his Chrony is right and yours is wrong.I have two Chrony units,and depending on the light,the velocity can vary by 100fps.Do you know someone else with a chronograph to get a third set of readings?
 
I wouldn't have suspected that his was wrong simply because my loads were 100+ fps below what I expected them to be in 2 different guns, with 2 different bullets and 3 different loads, one of them being a known load with known velocities.
 
Ganderite said:
The little windows look up to see the bullets pass. If the Chrony gets dropped, the window can look up at an angle.
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Has not been dropped, bashed, beaten, etc. I will maybe open the sensors to make sure they are seated properly though.

EDIT: Checked the sensors, they are encapsulated in a hollow in the plastic so they really can't move anywhere even if it was bumped or dropped. The plastic screens inside looked good too, no dirt, hair or cracks.

acrashb said:
Sensors not pushed all the way onto the mounting bracket?
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They were pushed on as far as they could go. Thanks for the input though. I will take it out again and make sure they are pushed on right, just in case they were off by an inch. Might be enough to throw it off.
 
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ced chrony

I too have a c.e.d. chronograph and i also have suspected it to be slow.i was out at the range this morning working up a load and breaking in a barrel at the same time.this rifle was custom built for me. it consists of a tuned s/a rem 700 jewel trigger tubbs pin/spring,1-8 pac-nor 29" barrel chambered in 6.5x47L.using a new 6500 tactical 4.5x30 bushnell.i had [2] powder loads re-15 and h4350 it seams every time i try and get to levels other shooters have reached i max out 2-3 grains below many others with very slow readings. i thought i just had a "slow" barrel but looking back at 5 other calibers it does look like 100-150 fps is the average that i think I'm getting in readings???? i plan to call c.e.d. tomorrow to find out if any recalls or such have happened
 
I've 3 chrony's.
Master Chrony Beta
Pact Chrony and
CED .
All 3 will give hinky readings if not set up for optimum use.Found lighting was an issue on all 3 so I use IF screens now.No problems since.
Skyscreens,light angles,shot angles,distance over eyes.....each can distort.
Try and follow manual recommendations for set up.Run some known velocities over it.
Then call service rep if issue persists.
 
ONT0001 said:
Run some known velocities over it.
Then call service rep if issue persists.
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These were known velocity rounds as well as new ones.

I emailed them and have had no response.

Chrony was set up in full sun with sky screens and as per manufacturers recommendations as it was every other time it was set up.
 
Strange. The loading companies and ammunition manufacturers have gotten away for a hundred plus years with stating higher velocities than their product actually produces. So now, Joe shooter gets his chronograph. Damn, lousy chronograph won't show the speed it is supposed to!
I have read several accounts lately of these slow reading chronographs. Why is it we never hear of a chronograph reading high!
 
You may have to look into the subject of statistics and specifically variation, then try to establish the variables that have an influence on variation. You may find that the variation observed is well inside the tolerance of the system. Include variables like case capacity, primers, variance in bullet dimensions, ambient temperature, temperature of the rifle and powder behaviour at different temperatures. Consider all of those and try to figure out the total uncertainty - you may be surprised.
 
Am I ever glad someone asked...I just got back fromt the range.I have a Shooting Chrony,alpha model...I loaded some 45acp with some fresh 230gr AIM bullets,5.6grs of win231 and a Fed primer.SO I pound off some rounds out of my Springfield 1911a1...5 inch barrel....and don't you know...I am getting 1410,1398,1399,1400 fps.Go figure...they shoud be 750ish.

Explain that one!!!


Cheers



H4831 said:
Strange.I have read several accounts lately of these slow reading chronographs. Why is it we never hear of a chronograph reading high!
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Johan22 said:
You may have to look into the subject of statistics and specifically variation, then try to establish the variables that have an influence on variation. You may find that the variation observed is well inside the tolerance of the system. Include variables like case capacity, primers, variance in bullet dimensions, ambient temperature, temperature of the rifle and powder behaviour at different temperatures. Consider all of those and try to figure out the total uncertainty - you may be surprised.
Click to expand...

Taking Temperature into consideration velocities should have been higher than expected as it was warmer this time testing than it was was in the fall when first tested the loads. Using Varget though would not have changed much, if any, based on the temp difference.

Cases, Primers, Powder, bullets are all the same lots/boxes/packages as last fall when load was initially tested.

My initial question was not to figure what could have gone wrong or what could have caused this but whether anyone had dealt with CED's warranty or repair facilities.

I have enough experience with the chrony and load development that setting up the chrony properly is not an issue.

As most anyone who reloads knows that they will have an expected velocity with a given load based on experience and or stated velocities. If their expected velocities were low on their chrony and at expected velocities on another, they (as I have) would most likely have their chrony looked at.
 
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How much of a temp difference between when you shot and when you shot last year?Lower temps can cause quite a change!!!EDITED To add I did not see the previous temp posts.
 
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