Thread: Whats the bees knees? Chrony

Hi team, me and my mate are looking at getting a chrony.
Budget up to 7 hundy.
What should we be looking at?

This one seems the bizo?
Model 35P System, complete

Oehler or Magnetospeed, personally I would go with Magnetospeed for ease of use

Kiwigreg should have comments about both

Sweet cheers EBF
One thing is we shoot from various uneven surfaces so a pretty adaptable stand/ tripod system would be good.
Looking forward to getting some loads measured

Puffin posted a sweet mod to make a $ 200 F1 shooting chrony more consistent, worth looking at.

Don't know anything about the magneto speed but the Ohler would be the top of the line optical sensor chrony.


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Mate and I have each just gone MagnetoSpeed. He got sick of his 35P not always triggering (bright sunny days, and some types projectiles) and I with a CED with IR screens - much the same issues. Extremely pleased with the MagnetoSpeed.

This is interesting
Review Comparison , Oehler 35, Magneto Speed, and Super Chrono

Is the magneto speed the barrel mounted one? Wouldn't the muzzle blast fuck them up??

Originally Posted by Gibo

Is the magneto speed the barrel mounted one? Wouldn't the muzzle blast fuck them up??

They use two electro magnetic sensors, measuring the interruption of the EM fields by the metallic bullet. That's why they are unaffected by environmentals.
I used mine for the first time the time the other day. I've never used a chronograph before, it was certainly as easy to use and reliable as advertised. As for the POI change I couldn't really answer, in my case as the rifle is new to me and not a tack driver. I'm accepting that if need be, I'll run speeds separate from any groups. I don't really shoot any groups anyway.

I did have to send the first one back as the LED display was buggered on arrival. Also, I hadn't considered the erosion on the bayonet from the muzzle blast. The wear from a single session wasn't out of this world, but hopefully was part of the design consideration.

Just wrap 2 layers of electrical around the forward end of the curved section. I think it is only a cosmetic issue myself.

Originally Posted by Moutere

They use two electro magnetic sensors, measuring the interruption of the EM fields by the metallic bullet. .

Also been using mine a lot lately for 22RF ammo tests. (unfortunately my EM332 loves the expensive SK Subs!) The MS detects lead bullets quite happily as well. You just need to change the bullet type to "slug" and take care to get the gap between the sensor and the bullet path to a minimum and away it goes.

you"may" have to shoot for speeds and groups separately with a weight hanging on the end of the barrel for speed readings.

Originally Posted by veitnamcam

you"may" have to shoot for speeds and groups separately with a weight hanging on the end of the barrel for speed readings.

Yeah good point. I really have no idea about this shit. Just want a good consistent reading.
Makes no sense if you cant shoot groups at the same time though

Originally Posted by veitnamcam

you"may" have to shoot for speeds and groups separately with a weight hanging on the end of the barrel for speed readings.

Not really, the 2 groups (top group 4 shots, bottom group 2 shots) were shot with the MagnetoSpeed attached. Generally accepted that the bullet will move away from the sensor and is in most cases the sensor is at 6 o'clock the elevation will be affected. The sensor would be just as happy mounted 3 or 9 o'clock and 12 for that matter (shooter may not be happy).

May affect thinner barrels perhaps. The thinnest I have used it on was my CZ Varmint 223 and accuracy was vg and no different to the groups I get without the sensor mounted.

I have found some scorching on the sensor arm but not on the sensors themselves. The scorching is cosmetic only and no biggie unless you get anal about such things.

Originally Posted by Gibo

Hi team, me and my mate are looking at getting a chrony.
Budget up to 7 hundy.
What should we be looking at?

This one seems the bizo?
Model 35P System, complete

Shipping on the complete 35P package you linked is absurd. I ended up getting my one locally for about $1100 from memory which was heaps cheaper than what it was going to cost to import.

It's a good system but there is no way you will get one new for $700 or less.