Rifles Only/Steinert Super Chrono

B

Blackbrush

Sergeant
Full Member
Minuteman
Oct 17, 2011
547
1
58
Somewhere down in TX
#1
I decided to pull the trigger on one of these chronos and after having a bit of difficulty ordering online direct from Germany, I learned that our very own Texas neighbors at Rifles Only are handling the product here stateside. A quick call on Saturday confirmed that they had the product in stock. A brief process to purchase on line from RO yielded a paid invoice and even a separate personal thank you email from RO. Tracking says it will be in hand today for $30 less than ordering from Germany. If the chrono is as good as (I expect good things from most German products) the service from RO, I'll be really pleased.

Disclaimer: The only association I have w RO is that we're Texans.

Carry on.
 
#3
I hope our dealings with Steinert go smoothly as well. I was impressed with the product and the concept. We almost signed up with another "new" chrono company recently, but Im glad we came across the different technology from Steinert before doing so.

And by the way Blackbrush, its Norway, not Germany.(At least thats what all the dealer paperwork says).
 
#6
Display is supposed to flash as battery gets low.

I just read about their forthcoming Bluetooth version that will display on a smartphone and allow additional statistical data as well as a soon to be released acoustic target. Very cool.
 
#8
I've used quite a few different chronos. My last one was a Magnetospeed and it never missed a shot and seemed to be quite accurate but I use a chrono as I develop my loads and I just couldn't get past the POI shift and the smaller effect that it has on group size.
 
#11
It is a nice and compact chrono. The only thing is that if you have a muzzle brake, you need to set it far enough forward away from the muzzle blast to be accurate. Otherwise it gets confused with bullet shock wave and muzzle blast.
 
#13
http://www.snipershide.com/shooting/s4-sniper%92s-hide%AE-equipment/187486-chronograph.html

there was some good info on set up for the chrono here^^

I have both the steinart and the magneto speed, magneto speed hands down for ease of set up , but the steinart is nice and compact and when set up you can get downrange velocity as well

if you look into the above pasted thread (post #16) I did (my attempt) a comparison between the 2 units, there both gtg

Ray
 
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#15
I've seen these "new" for around $360 on ebay. The mfg states the unit must be carefully aligned with the bullet path, aimed if you will. If you're off (from the bullet path)-or use their supplied spirit level your reported velocity can be off by 200fps or more. I don't know how you would know. With the 35P you get the second "proof" reading with every shot. I don't think the "huge shooting area" isn't that big a deal, as the mfg still wants the unit 10-15feet from muzzle for most work. The speed of sound, varies by atmospheric conditions (as we all know), not just in general, but even in a given area, wind can and does have a slightly different temp than the still air in a given area. I'll stick with the 35P.
 
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#17
I just received my Super Chrono from Rifles Only this weekend. Thanks to Lisa for such quick delivery!
I currently own a magneto but I do not trust it as there are significant accuracy issues when I use it when I gave my suppressor on. It measures about 75 fps too fast for some reason. I do suspect operated setup error but don't know what I am doing wrong.
Have not used the super Chrono yet. I will post when I do.
 
#21
Some days ago with the owner of Grande Armeria Camuna Italian importer of the Superchrono we did some test in Gardone Val Trompia with a very accurate crono used in Italy to all certification test .

the 2 PVM only 3 m/s of deviation, 2 meter for the Superchrono, with the Superchrono you have to do an accurate set up to have good results.



http://s34.photobucket.com/user/oneshot1964/media/G2_zpsf5deb2f9.jpg.html


http://s34.photobucket.com/user/oneshot1964/media/g1_zps72e75721.jpg.html


http://s34.photobucket.com/user/oneshot1964/media/G3_zps55d63d71.jpg.html

from the website

Convincing test at the National Proofhouse in Italy
 
#22
I have now had 2 Superchrono units for testing. Both had the tendency to repeat speeds. In a 10 shot string for example, I might see the velocity 2506fps 3 or 4 times. This repeated itself string after string on both units. They were returned and the most excellent dealer confirmed that there had been some issues with some units. I will wait for refinements before buying another.
 
#23
one shot, ive seen the yellow pvm before but not the orange. whats the story on the orange pvm? differences between the two models.

no doubt the magneto is awesome, but id sure like to see this acoustic win too and work properly, its got a lot going for it as well.
 
#25
the orange PVM is a custom, because the older structure was broken due a collision with the ground, it is very very easy to have this kind of damage, mine has a black tape to reinforce the structure, we did this one maintaining the distance between the 2 screens but with a bigger window, works well, this to reduce the probability to hit the crono downrange ( 400/500 meters ).. now with the acoustic crono we can put it far away with no more problems.
 
#26
#27
I don't want to give up my product idea, but the next iteration of the chrono should yield a microphone array in 3D... i.e. add more mics not on the same lateral or vertical plane. They should be able to do this pretty easily without much added hardware cost. The processing will take some work.

An example is here: Vehicle-mounted Acoustic Sniper Detection System. Notice the mics are diversied in space.

This will allow them to determine direction of travel in the 3D space and adjust in processing for any errors caused by the device being non-level or not directly inline with the rifle and target.

I'm also curious to what effects atmospheric conditions, i.e. altitude, humidity, and other factors effecting the propagation of the pressure wave will have on the accuracy and consistency of the device under different operating conditions.

Sorry for nerding out, but this I think is the best design for a Chrono on the market, except for the precision required in setup. It's just another place for something to go wrong, give someone a big headache, and can be avoided with today's technology.
 
#29

Makes sense. I'm not familiar with acoustic propagation and I figured they may have hard coded a speed of sound figure in their math somewhere, which would affect the supersonic cone angle referenced below. If everything is inline, I don't think they have to account for it and only identify the time difference between the "shockwave" portions of the shot acoustic signature in each mic.

If they did an array, I think it would have to be accounted for, but I'm not sure the variation of speed of sound with atmospheric changes and it may be a trivial detail.

This is an interesting summary paper I found on gunshot acoustics, which someone may find interesting : http://www.coe.montana.edu/ee/rmaher/publications/maher_aac_0406.pdf
 
#30

My point is that regardless of how long it takes the pressure wave from the projectile to reach the first microphone, it will take exactly the same amount of time for the pressure wave from the bullet to reach the 2nd microphone, so the interval between the pressure wave reaching the two microphones for a bullet of a given speed will be the same regardless of atmospheric conditions.

Joe
 
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