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Differences in Chronograph Readings

 
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  #8  
Old 04-15-2013, 10:21 PM
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Join Date: Apr 2008
Location: Dillon Mt
Posts: 164
Re: Differences in Chronograph Readings

cowboy
Thanks, looks like I need to pay attention to the details quite a bit better. I do get ERR often.
I usually just stretch out the cord, set the tripod down, line up on the target and go to shooting. It might be like getting a new one if I am a bit more careful about things.
Cliff
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  #9  
Old 04-15-2013, 10:30 PM
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Join Date: Jul 2007
Location: Billings, Mt
Posts: 797
Re: Differences in Chronograph Readings

Quote:
Originally Posted by CliffM View Post
cowboy
Thanks, looks like I need to pay attention to the details quite a bit better. I do get ERR often.
I usually just stretch out the cord, set the tripod down, line up on the target and go to shooting. It might be like getting a new one if I am a bit more careful about things.
Cliff
Hope things go well for you. Keep them moose safe down your way as I'm sure G&F have a tag with my name on it this year and I've got a couple ponies that haven't smelled moose blood yet
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  #10  
Old 04-16-2013, 12:45 PM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 5,953
Re: Differences in Chronograph Readings

A little late, but I'll mention I have the ProChrono and Shooting Chrony Alpha.

Started with the ProChrono about 15 yrs ago and got the Chrony A a couple years ago. I've set them up back to back a few times and I got variations anywhere from 5fps to about 70 fps and it and usually an inconstant variation.

The ProChrono seemed to give more accurate and consistent readouts based on published loads and factory published load velocities. The ProChrono usually works very well on overcast days. On Sunny days it will give more inconsistent readings including occasionally as much as 200 fps off, both high and low.

One day last week, It was reading about 3350 fps for a RUM load I was using, during the afternoon in the sun. A few hours later, i returned and the shadow of the overhead shelter moved out over the chrono and the readings went up to 3400 for the same load, just like that.

This is why I put limited trust in chronograph readings. I think they are good for ball park info, but that's about it.
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  #11  
Old 04-16-2013, 05:20 PM
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Join Date: Jun 2004
Location: Worland, Wyoming
Posts: 575
Re: Differences in Chronograph Readings

What I see as the problem with faulty chronograph readings is there are more and more people learning to shoot long range and while having a chronograph is a good tool, people need to understand that you must shoot your load at distance and prove your velocity and not just rely on what the chronograph tells you. It really helps to have some better numbers for accurate B.C.s available lately because that takes away another unknown. Information out is only as good as information in.
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Remington model 700 300 RUM LH 26" rem ss/blued receiver lam stock 215 Berger @3025/180 NAB @3300
Remington model 700 338 RUM LH 27" Broughton 5C 225NAB@3300 /300gr Berger@2830
Savage LH 22-250
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