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How to use my chrony properly??

Forums General Airgunning How to use my chrony properly??

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    Eddy1840
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    whats the proper distance between my muzzle and my chrony to get the best results.. 

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    Cliff_Allen
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    I always put mine about 2 to 3 feet in front of the end of the barrel. Close enough to get accurate muzzle velocity, but far enough away to avoid errors from “blowback” or whatever they call it. I’m not sure it that even is a real thing with air guns but I figure the extra foot or two isn’t going to hurt anything.

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    Chachoze
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    I’m usually only a few inches from the muzzle to the chrony.

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    Eddy1840
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    I have a fx impact, i have my chrony about 3 feet from my muzzle,when the shroud is extended it reads 900 fps but when the shroud is retracted it reads 1200 .. I have no idea why..

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    hunkaluv
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    My chrony is set up 12″ from the muzzle. For consistency, I also take aim at a target while shooting over the sensors. I position the target so that the pellet flight path (and height) over the sensors will be the same every time. It’s easy enough to do with a pcp, springers take longer obviously because of having to remove the rifle from the rests.

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    Keith2324
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    “Cliff_Allen”I always put mine about 2 to 3 feet in front of the end of the barrel. Close enough to get accurate muzzle velocity, but far enough away to avoid errors from “blowback” or whatever they call it. I’m not sure it that even is a real thing with air guns but I figure the extra foot or two isn’t going to hurt anything.

    
I used to feel the same way but as I looked at other units, my opinion changed. Especially after looking at the one attached below. It seems distance from the barrel or any air blast is not a factor in getting good readings. Consistency over the sensors would seem to be the most important factor.

    Keith.

    • This reply was modified 6 months ago by Keith2324.
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    kk4iz
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    “hunkaluv”My chrony is set up 12″ from the muzzle. For consistency, I also take aim at a target while shooting over the sensors. I position the target so that the pellet flight path (and height) over the sensors will be the same every time. It’s easy enough to do with a pcp, springers take longer obviously because of having to remove the rifle from the rests.

    
Both of my chronographs say 12 ft.  Caldwell G2 and Oehler 35P

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    Keith2324
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    “kk4iz”

    “hunkaluv”My chrony is set up 12″ from the muzzle. For consistency, I also take aim at a target while shooting over the sensors. I position the target so that the pellet flight path (and height) over the sensors will be the same every time. It’s easy enough to do with a pcp, springers take longer obviously because of having to remove the rifle from the rests.

    
Both of my chronographs say 12 ft.  Caldwell G2 and Oehler 35P

    
Caldwell states 10-15 feet for firearms. I do believe pellet guns are a bit different as there is no muzzle blast.

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    crosman2016
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    “kk4iz”

    “hunkaluv”My chrony is set up 12″ from the muzzle. For consistency, I also take aim at a target while shooting over the sensors. I position the target so that the pellet flight path (and height) over the sensors will be the same every time. It’s easy enough to do with a pcp, springers take longer obviously because of having to remove the rifle from the rests.

    
Both of my chronographs say 12 ft.  Caldwell G2 and Oehler 35P

    
Wow.  Twelve feet seems a stretch for an air rifle.

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    kk4iz
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    “crosman2016″

    “kk4iz”

    “hunkaluv”My chrony is set up 12″ from the muzzle. For consistency, I also take aim at a target while shooting over the sensors. I position the target so that the pellet flight path (and height) over the sensors will be the same every time. It’s easy enough to do with a pcp, springers take longer obviously because of having to remove the rifle from the rests.

    
Both of my chronographs say 12 ft.  Caldwell G2 and Oehler 35P

    Just got off the phone with Oehler  about setup for my Oehler 35 P for a PCP air rifle. They said 12 feet was best and not no less than 8 feet, you do have reprogram the switchs for 8 foot.
    Caldwell G2 does say 10 to 15, 12 feet falls in between that.
     

    
Wow.  Twelve feet seems a stretch for an air rifle.

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    I_Like_Irons
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    For the Oehler and the Caldwell, that is the recommended distances between the screens, not the distance from the muzzle to the first screen.  The further the spacing, the better the precision and accuracy of the readings.  That said, you need to take into consideration that this is an average velocity that occurs somewhere approaching  the middle between the screens. 

    For fixed short screen spacing, like on most inexpensive portable units, you just need to make sure that the muzzle blast is not creating a false reading.  With the longer spacing that you can achieve with the Caldwell and Oehler, this is usually not a problem as any air disturbances usually dissipate well before reaching the further screen.

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    jlc
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    I have the Pro Chrono Digital, with indoor light set and the wireless read out to your phone etc.

    The distance from the muzzle depends on what you are shooting, If traditional fire arms, rifle, pistol, shot gun. 5 to 15 feet.

    Bow, at least one arrows distance away to get the arrow up to velocity.

    With the pellet gun the instructions indicate that since there is no muzzle blast there is no restriction.

    Mine is set up about 10 inches from the barrel.

    For us the light source seems to be more of a concern.

    Since mine is setup in the basemen, 20 yard range, i light the target area but shoot from the dark, using the indoor infrared light set, i have had no issues.

    The blu tooth wireless readout to the phone, with the phone display brightness set pretty low and the night option setup on the shooting table, gives a great readout and accurate saved string. 

    • This reply was modified 6 months ago by jlc.
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