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questions on using chrony

Discussion in 'Shooting Related Threads' started by Hunter1978, Jun 1, 2010.

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  1. Hunter1978

    Hunter1978 Member

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    I got a chrony and have just started using it. How much veriation is typical/aceptable in speed of reloads. does it matter exactly where you shoot through the screens I've been shooting in the middle of them from 5 feet and getting a standard divation of around 21 using rem hull 19.5 green dot, rem primer, blue duster wad and 1-1/8 7.5 shot. I weight my drops and they seem consistant. getting an average of 1170fps
     
  2. Neil Winston

    Neil Winston Well-Known Member

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    If you are using a full choke, the SD is meaningless.

    Neil
     
  3. 221

    221 Banned User Banned TS Supporters

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    SD is what causes vertical.......oooouuuuups....my bad.....never mind.
     
  4. Quack Shot

    Quack Shot Active Member

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    Neil is right on that one. I use a choke as close to cylinder bore as I can get when chronographing with "Light" screens. If you are getting fairly consistent results, then you are probably doing it right. Keeping yoru distance and aim point consistent can make a different in the accuracy of your results. If all you are looking for is the average velocity of a load, then you should be good to go. I chronographed a load very close to yours and had similar results. I don't use Duster wads, so that would be the difference between my load and yours.
     
  5. JACK

    JACK Well-Known Member Supporting Vendor

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    About 20FPS is my experience with my ProChrono. I use the same load as you except I drop 1-1/16 oz lead. Speed jumps up about 60FPS to 1230. But using a lite Full Choke gun puts some shot out ahead of the pod and likely the chronos are measuring those few faster pellets. I do not know for sure. Neils onto something with that cylinder bore stuff.
     
  6. Hunter1978

    Hunter1978 Member

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    My loads were mostly within 20 fps of each other (other then one without powder 57fps) but I did run 10 remington gun clubs (factory loads) that averaged 1200fps but I got anywhere from 1136 to 1256 fps on them.
     
  7. Jon Reitz

    Jon Reitz Well-Known Member

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    Hunter,

    Just curious, what type chrono are you using?

    Thanks,

    Jon Reitz
     
  8. himark

    himark Well-Known Member

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    I use the Chrony and found they were faster than they really are by about 30 fps. I used the charts to compare than also used known factory loads assuming the factory loads are close to advertised speeds 25-30 FPS faster reads.
     
  9. himark

    himark Well-Known Member

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    Oh just for reference, 14.5 grains 700X and a 1 oz load full choke showed 1200 FPS 1208 FPS 1192 FPS. These spec out of the book at 1100 FPS. I truely feel there actual speeds were 1180 ish.

    EDIT, one thing I have done since chrony was new is to lay a 2x4 on edge right in front of the reader to prevent damage. It has caught a couple bb's over time so it may save you a chrony.
     
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