What Chrony?

legi0n said:
So, you experienced a 200 fps between 2 rounds shot 1 day apart.
And you compare this with shooting 2 rounds seconds apart.
And you can't see the difference!?

Let me tell you, your scientific method lacks substance.
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And exactly what would you attribute a 200 fps spread for the same load, fired from the same rifle at the same altitude and temp, 24 hrs apart............these were 5 shot avgs, and as I recall the ES was somewhere in the 20-30 fps range. That is called a lack of repeatability and is a flaw with the chronograph, not with my method. I actually did this because I suspected the chrony was lying to me, so I used my favorite load from my 22-250 to test it out in different lighting conditions. I also noticed the error grew larger the smaller the bullet and the higher the velocity.
I do believe you misread my post, when I said I chronographed loads, I'm not talking 1 shot, it is usually strings of 4 or 5 shots and sometimes 10........in this case they were 5 shot strings on two consecutive evenings with an avg that showed an over 200 fps difference.
 
c-fbmi said:
I own 5 chronographs and let me tell you Chronys are garbage, I had a 200 fps difference from one evening to the next with the same load but different lighting conditions.........junk!!! I have 2 Oehler model 35 Ps and they give me identical readings regardless of light and shooting them side by side or in tandem. A cheap chronograph is a waste of money and tells you absolutely nothing!!!
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The difference comes from air pressure, air density, temperatures.

I run chrono at major IDPA matches in the US, and DQ'd a friend because his ammo chrono'd at 162500 instead of 165000. This was the same batch of ammo chrono'd 2 weeks earlier and passed.

The temp 95F and extremely dry and 2 weeks later it was 95F with 95% humidity.

You can get a difference on the same day too. Ex - morning and then afternoon.

I have 3 chrono's. A PACT professional and 2 Shooting Chronys, a Beta Master and an Alpha Master. They are generally 5% of each other.
 
RePete said:
The difference comes from air pressure, air density, temperatures.

I run chrono at major IDPA matches in the US, and DQ'd a friend because his ammo chrono'd at 162500 instead of 165000. This was the same batch of ammo chrono'd 2 weeks earlier and passed.

The temp 95F and extremely dry and 2 weeks later it was 95F with 95% humidity.

You can get a difference on the same day too. Ex - morning and then afternoon.

I have 3 chrono's. A PACT professional and 2 Shooting Chronys, a Beta Master and an Alpha Master. They are generally 5% of each other.
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I can see differences like that, RePete due to atmospheric changes, but not 200 fps in 24 hrs with the only real change being lighting. This Chrony would also start to give faulty readings as the light waned in the evenings. My 35Ps will as well after the light gets too low but they just show error at that point. I just could not trust that Chrony after that, both sessions were mid afternoon and like I said the only appreciable difference was the lighting conditions. Just a waste of my reloading components when the information received is not trust worthy and one is always wondering exactly what lighting conditions give accurate velocities.
 
I haved used my chrony (F1 I think) for years with pistol, rifle, shotgun and even arrows. It is accurate and still works likes a charm. In fact I was using it at the range while another fella had a different chrongraph. We played around and shot our rifles through each chrony to check how close they were are both were close. For the money, which isn't much, mine works great.
 
Why exactly are you messing with Chrony brand when you have 2 Oehlers? There must be a reason that chrony's are $125 and Oehlers are a lot more. FS
 
I set up the screens of my Oehler 35P on a rail, and place the Chrony between the first and center screen. The 3 screens of the M-35P provides 2 readings per shot, and will not give you an error message when you're working up loads and are getting near max, which seems to happen with regularity with my Chrony. The charm of the Chrony is that its fast and easy to set up. The difference in readings is pretty dramatic though, with differences of as much as 80 fps. I tested a Magneto Speed last year and posted the results (http://www.canadiangunnutz.com/forum/showthread.php/935133-MagnetoSpeed-Chronograph). I thought the Magneto Speed was interesting, and although it costs nearly what the Oehler cost, there are no screens to mess with. But the best might be the new Dopler Radar unit coming out in the next few months from mylabradar.com, they apparently made an impression at the Shot Show. If the price is as expected, I might have to bite.
 
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Fassteel said:
Why exactly are you messing with Chrony brand when you have 2 Oehlers? There must be a reason that chrony's are $125 and Oehlers are a lot more. FS
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FS.........I thought my first Oehler was screwing up and it wouldn't read more than 1/2 my shots, so I went down to the LGS and bought a new Chrony, the one with the remote head etc. I decided it was lying to me after a few weeks of playing with it so I phoned Oehler about my original 35P and the teck said I didn't need new screens, just disassemble them and clean the lenses, which I did. It now works 100% again. Then Oehler reintroduced the 35P, which had been out of production for about 5 years or so, so I grabbed another because Oehler said they were only doing a limited run and then shutting down production again. Don't know if this has actually happened or not. Way back I also bought an old paper screen Oehler Mod 10 from Guntech, we're talking 40 years ago now. Ran out of the screens he gave me with the Mod 10 only to find out they were no longer available a few years later. Then I bought a Chrony when they first hit the market for $89.95 and it was a POS and not a lot better than guessing. Then my 2nd X-wife bought me the first Oehler 35P for Chrismas shortly after they were first introduced.
And that's the long story of why I have 5 chronographs, and the opportunity to compare 2 Oehler 35Ps with one of the latest Chronys.
I am building a shooting shack on my property, with 100 mtr range, inside will be noise baffles and the 2 Mod 35Ps permanently set up in tandem with a continuous AC power supply and the exact same lighting day and night, year after year. No more wondering if the light is dicking me around, shadow errors, birds flying by, range warning lights or any of the other anomalies I have experienced while trying to develop loads. Hoping to have it all done up by mid summer...........then life will be good.........
 
c-fbmi said:
FS.........I thought my first Oehler was screwing up and it wouldn't read more than 1/2 my shots, so I went down to the LGS and bought a new Chrony, the one with the remote head etc. I decided it was lying to me after a few weeks of playing with it so I phoned Oehler about my original 35P and the teck said I didn't need new screens, just disassemble them and clean the lenses, which I did. It now works 100% again. Then Oehler reintroduced the 35P, which had been out of production for about 5 years or so, so I grabbed another because Oehler said they were only doing a limited run and then shutting down production again. Don't know if this has actually happened or not. Way back I also bought an old paper screen Oehler Mod 10 from Guntech, we're talking 40 years ago now. Ran out of the screens he gave me with the Mod 10 only to find out they were no longer available a few years later. Then I bought a Chrony when they first hit the market for $89.95 and it was a POS and not a lot better than guessing. Then my 2nd X-wife bought me the first Oehler 35P for Chrismas shortly after they were first introduced.
And that's the long story of why I have 5 chronographs, and the opportunity to compare 2 Oehler 35Ps with one of the latest Chronys.
I am building a shooting shack on my property, with 100 mtr range, inside will be noise baffles and the 2 Mod 35Ps permanently set up in tandem with a continuous AC power supply and the exact same lighting day and night, year after year. No more wondering if the light is dicking me around, shadow errors, birds flying by, range warning lights or any of the other anomalies I have experienced while trying to develop loads. Hoping to have it all done up by mid summer...........then life will be good.........
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Sounds like life ain't too bad already............FS
 
The conclusion I have drawn from this thread is that all chronographs are temperamental, finicky pieces of crap, regardless of make or brand. So I went and bought a Competition Electronics 3800 ProChrono from Henry at Budget Shooter Supply. I'm sure it'll be a temperamental, finicky piece of crap. But I can rest comfortably in the knowledge that all of them are. ;)
 
For me, I have always used a Chrony for my bow and rifles, great price, great quality and I am up to twenty years without any issues !
 
i use a superchrono, light, accurate, not finicky . easy to use and understand, HUGE area that it will regiester shots ( IIRC 20"w x 50" tall)


down side - no option to show SD or ES (ES is easy to just look at the numbers and find yourself), only "average" , its acustical, projectile needs to be mach 1.1 minimum,
 
Tagged...I might want to purchase a temperamental, finicky pieces of crap in the near future and refering back to this thread will be a big help...har har :)
 
I have tried a few of them and liked the CED M2 the best. We now sell them because of that. With the optional infrared screens, you can shoot in the dark if you want and get consistent results. The infrared system is a must for indoors as well. They also have a battery pack to make it completely portable. The little computer that comes with it calculates averages, high/low, power factor etc. It is also VERY consistent.

The system keeps track of your shots so you don't have to write them down and you can even set it up to vocally read them to you as you shoot.

http://fasttoys.net/ca/CED-Canada-M2-Chronograph-Set/
 
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