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View Poll Results: Which brand of shooting chronograph do you use?
Shooting Chrony 662 36.74%
Oehler 285 15.82%
CED M2 240 13.32%
Pact 160 8.88%
PVM-22 16 0.89%
Pro Chrony 439 24.36%
Voters: 1802. You may not vote on this poll

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Which shooting chronograph do you use?

 
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  #106  
Old 09-19-2013, 02:48 PM
Silver Member
 
Join Date: Dec 2010
Location: Lake Tahoe, Calif.
Posts: 238
Re: Which shooting chronograph do you use?

Interesting....BnG. Wondering how the Chrony could be off 100fps on some rifles but not on others.

In the last few weeks I've noticed my velocities dropping aout 60 - 80fps on loads that were done at a different time from each other but a very consistent recipe . I thought maybe I need to totally decopper, but more copper in the barrel seems like should cause higher velocities due to pressure and speed, not less. Then I started wondering if there has been drift in my Chrony. But I found some older rounds and they reported within 20 fps of what I had recorded.

So I have a few questions, though maybe off the topic of chrono for a minute...

1) Does there come a point where copper fouling causes maybe more pressure but a drop in velocity due to added friction?

2) Has anyone seen velocity reports change like that with the use of a single chronograph over time? They are digital devices so seasonal temp changes shouldn't affect them. The clocking signal is typically generated by a quartz "chip" though and that could be responsible for a 2% change if they get really hot or cold. But temps here have not been extreme; between 70 & 85 degrees.

I HAVE noticed that the new Winch brass I bought seems to be a little "slower" than the Federal I've been using all along.

It almost seems like the little Varget that i have left has become "weaker". I have never experienced this before.

I cleaned the barrel but not totally decoppered, loaded a test set .5gr hotter and plan to go out in the next day or so to see what happens.
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  #107  
Old 09-19-2013, 03:35 PM
Platinum Member
 
Join Date: Nov 2008
Location: SW Montana
Posts: 4,550
Re: Which shooting chronograph do you use?

I think being of has more to do with lighting condition, I've also noticed changed from setting it out with a gravel surface vs a reflective snow surface, I do most of my shooting in the evening after work and as the sun goes down I used to watch my velocities change, then I'd get an error and finally it's just not catch anything. My magneto speed give me the same velocities in every light condition, I've got data in rain and high winds that was good. My ES has definitely come down with the Magneto speed, I shot up a lot of components chasing chronies!!
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  #108  
Old 09-19-2013, 07:09 PM
Silver Member
 
Join Date: Dec 2010
Location: Lake Tahoe, Calif.
Posts: 238
Re: Which shooting chronograph do you use?

Yes, I can believe that lighting conditions might have something to do with variations in velocities that I've been seeing lately. I don't use it in the snow much but since I shoot for hours at a time the angle of the sun changes. I am most often shooting in direct sunlight out here in sunny the Sierra Nevada mountains of California. I have never felt like I was chasing the accuracy of the Pro Chrony because my accurate loads are very consistent. Its just recently that speeds have dropped some so I'm considering everything and it may be the Chrony.

I wonder if the manufacturers have tried making them with IR sensors and found that to be a no-go. I would think the pills are surely hot enough at 12 feet from muzzle to register a signature.

Anyway, the main thing is to find an accurate load and get a reliable snapshot of velocity and consistency as another data point to determine downrange energy and if you can't shoot at many different distances and simply observe, to calculate drop.
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  #109  
Old 09-19-2013, 09:15 PM
Gold Member
 
Join Date: Sep 2005
Location: Central AZ
Posts: 939
Re: Which shooting chronograph do you use?

Could your change of velocity be possible due to a change in the temp of your powder/round. With some powders, a change in temp (not air temp, but ammo temp) could be the result of the change.
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  #110  
Old 09-20-2013, 08:54 AM
Silver Member
 
Join Date: Dec 2010
Location: Lake Tahoe, Calif.
Posts: 238
Re: Which shooting chronograph do you use?

AZ- Thanks for the suggestion.

Actually, I've been paying more attention lately about keeping my ammo in the shade, thinking that I wanted to keep it more stable, but these loads have been so consistent over time that I didn't consider that in these latest outing where the velocities went down. That might actually have something to do with it. Its Varget which I understand to be pretty temp insensitive. I gotta go back and look at my winter records when its in the 30s - 40s.

I haven't been able to find any Varget for 9 months now but I have enough to get me through deer season so experimenting is taking a lower priority than scouting and target practice. I don't think 100 fps is going to make a difference to the deer but I do want to establish a valid zero out to 350 yards. I consider these loads good out to that.

(I don't know who's getting all the powder- all the stores say they are just not getting deliveries and when they do its gone immediately of course. If they're not getting it who is??)

Going out today or tomorrow to run final tests and final zero.
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  #111  
Old 09-20-2013, 09:42 AM
Gold Member
 
Join Date: Sep 2005
Location: Central AZ
Posts: 939
Re: Which shooting chronograph do you use?

Not sure if you have seen this:


Parts 58 and 59 explain a lot about how temp effects velocity and by how much. It's a great series.
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  #112  
Old 11-22-2013, 05:05 PM
Junior Member
 
Join Date: Apr 2013
Posts: 1
Re: Which shooting chronograph do you use?

Magnetospeed V1 and V2.
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