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Thread: bow speeds

  1. #1
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    Default bow speeds

    was wondering for you that use a chronograph how much variance do you get while shooting? I am getting 4-14 depending on when i am shooting. I am pretty sure i am not creeping any but very unsure of what is going on.

  2. #2
    Senior Member Ehunter's Avatar
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    With most of my old bows, I'd get a 4-7 fps variance. With my "09 Firecat, I'm actually getting a 0.4 variance. That's for a 6 shot string. Can't belive it's that close, but I have checked it several times. Shooting 317.8-318.2 for 6 arrows.

  3. #3
    Destroyer
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    Quote Originally Posted by cridertj View Post
    I am getting 4-14 depending on when i am shooting
    In the same session you get 4 to 14 fps difference or you get the variance on different day's that you shoot? Lighting conditions can effect it but so can the individual quality of the bow.

  4. #4
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    My chronograph rounds off to whole numbers, and during a series of 10-20 shots, I'll typically see a couple shots +/-2 fps off my average.
    I know my complete arrows are not identical in weight, varying up to 4-5 grains for about 1fps of that rounded number, and my draw/release may not be 100% exact every time, then the bow itself will probably have a little difference each shot.

    I've checked a couple times to see what effect big temp/humidity changes might have.....like home during hot/dry mid July at 2700-3000 ft vs couple times I checked to see what happens during a cold/snowy late Nov hunt in the mtns at 6000+ ft, and seen about 5fps lower

    Have seen some shots that dropped +/-10fps low, but that was often me punching the shoot and letting up just a little right at release, or the battery and/or lighting was getting weak and throwing some random off numbers.
    2009 Martin Bengal M2 Pro Cam w/factory STS & CCS.....66lbs, 29" DL, 422gr @ 272fps, Winners Choice string/cable, Trophy Taker drop-away Rest, Scott Release
    1996 Martin Firecat XRG Pro Series w/Ultra Sonic wheels.....69lbs, 29" DL, 465gr @ 245fps, w/fingers & Martin leather glove

  5. #5
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    my readings are on different days with a lot different temp.

  6. #6
    SonnyThomas
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    Default bow speeds

    My target arrows are real close for weight, not varying more than 1 gr from lightest to heaviest. Readings might vary 1 fps, but then a lot of times I get the same reading and/or "Dup" showing. Anything beyonds this and I re-test and usually the reading falls in with the rest. Of course centering to the chronograph, the same distance and aiming at the same spot throughout gives better results.

  7. #7
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    Quote Originally Posted by cridertj View Post
    my readings are on different days with a lot different temp.
    Ahh, not in the same session. Lighting and or temp could be the culprit. ProChrono?

  8. #8
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    ya the pro chrono are they a little touchy on lighting

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