Muzzle speed Meter with tripod $28.92 @ AliExpress

[Fate]

I have a finger sleeve from some of my wife's stuff that I keep on the muzzle of my Mrod. It takes me ten seconds to attach the chrony securely. With the sleeve's forgiving thickness I just slide the chrony on to use it and slide it off to charge it or put it down. The sleeve also prevents any marks on the shroud. I leave it on all the time... it's a good hold point that keeps fingers off the metal and protects the gun wherever I lean it.

With the little sleeve on there I just spread the two halves of the clamp and slide it on, checking the four screws to make sure they're all even. Turn it on and go.

It doesn't change a thing on my gun, nothing really does. It did before I O-ringed the shroud clamp, but now it always holds the same POI no matter what.

This little chrony is invaluable. A PCP isn't like a springer... those do what they do. But on a PCP like a Marauder with its tuning potentials? If you don't have a chronograph you may as well have bought a springer. This little thing has allowed me to tune to my gun's potentials, works inside and out and has no lighting concerns. I like it so much I may get another one just for a spare... in case.

[Back_Roads]

 Here is a thought I just had, I have the clamp-on BTW. One could clamp a tube to a gun rest/ shooting vise, and have it track the barrel alignment, vise could be left as crono rig if used just for that.

[mwgm2020]

I just ordered one on ebay for $28.97 including shipping.  Thanks for the link.  I'm really looking forward to testing pellets and slugs!

[mst3kpimp]

Man ebay sent me a $25 off code so I got it for $3.48 shipped!

[cilami]

This is my version. Attached to my homemade gun rest. Functional and simple.

[mwgm2020]

My daughter just said, "Daddy you received a package, did you see it?"  NO!  Where is it???!!! 

So my new cheapo chrony arrived today instead of the 11th and I just found out.  I'm dying to try it out, but it is too late tonight.  It is smaller than I thought but surprisingly heavy for its size.  And the instructions are entirely in Chinese, I think??

[Lonewolf54]

  And the instructions are entirely in Chinese, I think??

See reply #115 to download instructions in English for either model.

[Bentong]

Ordered one and paid $3.49. Am HAPPY 😁

[Earl]

Links to the instructions in English are from Doug on Page 6, Reply#115.
Thanks to Doug, Lonewolf54, for the translation to English!
I have 3 chronographs and this is the one that I use the most on airguns.
Has anyone tried one of these on a 22LR?

[mpbby]

I received mine around March/2019 and I use it to follow the spring and seals’ health of my breakbarrel coils spring. After some measuring along the year, I did a (few shots) comparison with a Pro Chrono in November/2019.  Both were giving the same results for the average FPS (“21” FPE / spring with “5.3” K rounds), but a bit different regarding ES (0.8/1.4%).  For my practical use, I thought the Chinese one was fine (also the rifle).

Some months ago, I did a recharge with my laptop/USB, and thought everything went ok.  Nevertheless, the numbers become a kind of erratic. 
A few days ago, despising some ‘crazy’ numbers, I considered only the ‘plausible’ ones for the average, and FPE had dropped to “18”.  Regarding ES, I was not confident to ‘conclude’ anything, but was considering to replace the spring (7.0 K rounds), and see the OEM piston seal..; also thinking about replacing the OEM breech seal, just in case..

Today, (7.1 K rounds) I did a 10 rounds measuring with a Pro Crono and things were different..  FPE = “21” and ES = “2.5”%.   I use the Pro Chrono at the shooting club, and, in both times, the available devices were in very good conditions (almost new), and no ‘errors’ along the series.

Passed to my mind the possibility that the measured FPE is a kind of “too good to be true”(!?).  Maybe, the Pro Crono is consistent, but not accurate?  Anyway, I am considering the Chinese as not reliable, and, for now, I will not do any maintenance. 

I will keep the comparisons, to see if it recovers the credibility; at least.. consistency, a ‘reasonable’ ES along the series.

[mwgm2020]

I received my unit yesterday as today I shot 80 rounds using 7 different pellets. 10 shots per pellet and shot the COHP’s twice because the first group had too much variation in speed. The unit gives speeds in meters/second. I had a surprise once I sat down to do the conversions to ft./sec. the numbers where a lot slower than expected. The CPHP’s were nearly 200 ft/sec slower than the speed report that came with the rifle. So now I’m left to wonder if there is a problem with the chrono, the rifle or both.

[Earl]

I received my unit yesterday as today I shot 80 rounds using 7 different pellets. 10 shots per pellet and shot the COHP’s twice because the first group had too much variation in speed. The unit gives speeds in meters/second. I had a surprise once I sat down to do the conversions to ft./sec. the numbers where a lot slower than expected. The CPHP’s were nearly 200 ft/sec slower than the speed report that came with the rifle. So now I’m left to wonder if there is a problem with the chrono, the rifle or both.

The advertised speeds for many rifles are more than you can get with lead pellets.

[mwgm2020]

I received my unit yesterday as today I shot 80 rounds using 7 different pellets. 10 shots per pellet and shot the COHP’s twice because the first group had too much variation in speed. The unit gives speeds in meters/second. I had a surprise once I sat down to do the conversions to ft./sec. the numbers where a lot slower than expected. The CPHP’s were nearly 200 ft/sec slower than the speed report that came with the rifle. So now I’m left to wonder if there is a problem with the chrono, the rifle or both.

The advertised speeds for many rifles are more than you can get with lead pellets.

I’m not using marketing numbers. Benjamin included a 5 shot QC target and a 10 round chronograph printout tape with the rifle. My understanding is Benjamin uses the CP Domes for the target and crony testing which should be near enough to the CPHC’s to use as a benchmark.

So I am showing a 200 FPS loss compared to the chrony printout that Benjamin put in the box. I received the rifle early May of this year, and it is a Fortitude Gen2.

Has anyone else experienced a similar difference in reported speed using one of the cheap chronies?

[Xraycer]

When I first got this small unit, I'd shot along with my  Caldwell unit. There were only a difference of about 3 fps.

[Fate]

I received my unit yesterday as today I shot 80 rounds using 7 different pellets. 10 shots per pellet and shot the COHP’s twice because the first group had too much variation in speed. The unit gives speeds in meters/second. I had a surprise once I sat down to do the conversions to ft./sec. the numbers where a lot slower than expected. The CPHP’s were nearly 200 ft/sec slower than the speed report that came with the rifle. So now I’m left to wonder if there is a problem with the chrono, the rifle or both.

The advertised speeds for many rifles are more than you can get with lead pellets.

I’m not using marketing numbers. Benjamin included a 5 shot QC target and a 10 round chronograph printout tape with the rifle. My understanding is Benjamin uses the CP Domes for the target and crony testing which should be near enough to the CPHC’s to use as a benchmark.

So I am showing a 200 FPS loss compared to the chrony printout that Benjamin put in the box. I received the rifle early May of this year, and it is a Fortitude Gen2.

Has anyone else experienced a similar difference in reported speed using one of the cheap chronies?

Stephen, where does your understanding of the pellet used come from? My Synrod came with a target, too, but it didn't specify what pellet was used.

FWIW, my little chrony has never missed a shot, nor does it produce data that makes me think it's inaccurate... but I've never compared it to any other chrony either. To me, it's all relative... that is, I use it for tuning, and measuring the results of different settings. However, I do use the speed info in Chairgun for setting up my scope, and actual downrange results verify its accuracy.

There are methods to determine pellet speed by shooting in correlation with a ballistics program like Chairgun. It's a good way of finding the bottom line regardless of chronograph used.

From all the many threads on this unit I've read, my results are normal. Also from years of reading about published airgun speeds, it is a given they almost universally use the lightest pellet available for the caliber to determine those published specs. So unless it is specifically spelled out one must assume they're NOT using any other pellet.

All that said, if there is a specific pellet listed that was used in your chrono printout, and you're using the same pellet and not getting those results... and have made no adjustments to your gun... maybe the gun is defective, and maybe the chrono is defective. All maybes. The chines chrony is cheap, all things considered it might be a better option to get another chrony instead of going through sending the gun back. I've ordered a second chrony, mainly as a backup because I rely on it. But I'll also be comparing them of course. But 200 fps off is a lot, although you've not mentioned what the printout speed is or your measured speed... only the difference. Maybe providing that would help?

[HunterWhite]

What formula are you using to convert meters per second to feet per second?

[SILENT SQUIRREL]

What formula are you using to convert meters per second to feet per second?

MPS X 3.281 = FPS

https://www.convertunits.com/from/fps/to/m/s

Hope this helps

Ed

[HunterWhite]

Yup.

[Fate]

What formula are you using to convert meters per second to feet per second?

In my case, I use a phone app... Converter+. Same thing only easier to carry around than a laptop. I do use an online converter for converting fps to muzzle energy per pellet weight at  https://nielsenspecialtyammo.com/pages/fpe-calculator . Using just my phone at my shooting bench I simply plug the chrony's numbers into the app, then the resulting fps into the website's converter to keep track of shot strings for all pellet weights I'm using.

It's a little more time consuming with the little chinese chrony but works for me.

[Nvreloader]

I just used mine today on the Dan's chrono test on a reseal, (results posted in the Vintage gate section).

I am not sure if I believe the results, I did convert the mps to fps by using 3.281 conversion factor.

I'll have to dig out the Oehlers and compare results,
I sure wish I could have used my V-3 Magneto chrono...............

Don