This is my Chinese-made cheap chrono. It was working pretty well with my 300mm barrel, until I upgraded it to 500mm. I'm using an FX Dreamtact. I've tried indexing the liner, and now it can read slugs (11 grain). Pellets (10.34gr) have to be tuned down pretty low, below 650fps for it to read. As for slugs, it has no problem reading any velocity. This is a bit perplexing for me. Can anybody help me out?
FX Funny thing with this Chrono
- Thread starter dlancerx
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You've just found the weak spot of optical chronographs. I might recommend trying to tape off as much as you can to prevent light pollution from messing with the sensors. It will break the "beams" more effectively if it's a dark box.
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My cheap Chinese chrony went crazy a while back, giving readings like 490 m/sec. That's well past the speed of sound, and you'd notice that supersonic sound barrier crack if it was correct. Could just be time for another one.
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Like said in post #2 i use cardboard .
It has to be a just right daylight/sun to affect it its rare to use sun shields . I shoot .177 and been spot on ..
Oh. .. what is your chrony rated to
When i shopped i noticed some speed ratings were low vs others
( "Range")
This one is 999/mps and some eere like 600/mps. Big difference in there speed range
It has to be a just right daylight/sun to affect it its rare to use sun shields . I shoot .177 and been spot on ..
Oh. .. what is your chrony rated to
When i shopped i noticed some speed ratings were low vs others
( "Range")
This one is 999/mps and some eere like 600/mps. Big difference in there speed range
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Probably not your issue, but I tend to just slap it haphazardly onto the barrel without aligning properly. Also, errors start occurring when the battery gets low and needs recharging.
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I have one like that and it has never failed to read a projectile, mostly pellets but some slugs, as long as it was charged. I mostly use it indoors, however. Outdoors I use a different inexpensive one that is made for tripod mounting. It sometimes misses a shot if the barrel is not well centered - and when it needs charged. I've never put sun shades on it. But I shoot from a covered porch so it is not in direct sunlight.
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