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Posted: 6/26/2011 3:56:14 PM EDT
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I had a hell of a time with this thing initially, then shot it, so in January I sent it back and paid to have it fixed. The calibrated it, tested it - pronounced it good. I was so discouraged by the whole prior experience (seems far too complex to measure velocity), I didn't look at it again until yesterday.
Took it out on the back deck, tested it with an air rifle - worked great. Tested it with the printer, worked great. Went to my outside range and it didn't work well at all. Set up in a $20 camera tripod - first I was maybe 5' and shooting a 1911 - reading 2300 FPS, so I figured it's catching the shock wave from the blast. I move it out to about 12', maybe more, certainly not less. Run some factory FMJ 230g to get a baseline Out of 10 shots, maybe 6 were in the 836-860 range, which I figured was good. Other shots 600 FPS, so I just tossed them - no ERR1/ERR2, so I know I am passing through the electronics properly. OK - so I move the chrony to be better centered against the backstop, then level it - you know so there is no horizontal angle to adversely affect the readings, same with the horizontal leveling. Now I run some some reloads and get consistent FUBAR readings - should be close to 900 FPS, reading 290 or something. Using a Lyman manual, max is 5.8 and I am at 5.4 - BTW I have worked up these loads before, so I know I am in a safe range. No way the velocity is 290, so the readings are dead wrong, no doubt in my mind. Now when I used it (and someone else's) before, I noticed that where the bullet passes through the V does affect the reading. Too low or too high in that window reads differently. There is certainly a sweet spot in that V vertically where it reads properly. Anyway, I shoot, low, I shoot high, I shoot in the middle desperate to find where it reads accurately - and no soap. Never found the sweet spot. After maybe 200 rounds, I was sufficiently pissed to simply pack it up calmly - an accomplishment for me - and just shoot a bit with 3 1911s. I plan on calling ShootingChrony Monday, but I just don't get it. No ERR1/ERR2, so it passes through properly; yet, I get a reading that is completely out of line with reality. Any suggestions are most welcome. |
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Everything about the state you live in.:)
I'll send an email tomorrow Mark. Yours could be off but my Chronagraph does some goofy stuff to if clouds overcast or not holding in sweet spot. I use at least 5 shots to measure from. ES more than 100 fps leaves Chronagraph to question. My loads seldom have ES more than 50fps. Posted Via AR15.Com Mobile |
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Quoted:
Everything about the state you live in.:) I'll send an email tomorrow Mark. Yours could be off but my Chronagraph does some goofy stuff to if clouds overcast or not holding in sweet spot. I use at least 5 shots to measure from. ES more than 100 fps leaves Chronagraph to question. My loads seldom have ES more than 50fps. Posted Via AR15.Com Mobile AhHa - so I am not the only one discovering the sweet spot I see. The thing that crossed my mind was making things that actually work at a reasonable price. If I had the contacts in production, I could spend the rest of my life making better products cheaper - that actually worked. Don't kill yourself on the email - I appreciate it and all - but SC is gonna get an earful. IMHO it's a crappy product and how hard can it bee to read a velocity 
Thanks David |
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Check the battery. Mine was the same thing. would read an air rifle ok ,but anything else was EER . if it don't work with a new battery, trash it and get a pro chrono digital That is easy. Thanks. Not that I think that's it - no ERR readings, but worth replacing a battery. Also doesn't explain the factory reading SOME shots accurately either. IIRC the thing will exhibit some indication of a low battery - saw none of those either. I can't tell you how pissed I get dragging that thing for naught. I may test a suppressed .22 on the back deck - when the wife isn't around 
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Four inches over the sensors and the bullets have to pass as straight as possible over the sensors. The instrument can be set up to measure perfectly at one target and out of misalignment to producd reliable measurements when shooting at an adjacent target. I align the chronograph by looking directly down the bore of the rifle from down range just in front of the chronograph.
Don't put the chronograph in the shade or try to shoot when the Sun is low in the sky. |
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Quoted:
Four inches over the sensors and the bullets have to pass as straight as possible over the sensors. The instrument can be set up to measure perfectly at one target and out of misalignment to producd reliable measurements when shooting at an adjacent target. I align the chronograph by looking directly down the bore of the rifle from down range just in front of the chronograph. Don't put the chronograph in the shade or try to shoot when the Sun is low in the sky. OK - I'll mark the guide roods and have another go at it with fresh batteries. Thanks |
the sweet spot for my pro chrono is anywhere between the blue tape. Just shot an airsoft pistol at the top blue tape and it read every one of them. they go about 175fps. I've even been to the range and threw a rock by hand through the rods and sometimes they read. mostly 27-29 fps.
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