New Chronograph

T

Tom Berridge

Guest
I was at the range on Tuesday and looked about four benches down and there was a guy at that bench with a rifle that looked like it had a bayonet on the end of the barrel.
I walked down to see what it was,and it turned out to be a chronograph. This thing attached to the end of the barrel with a felcro strap and a thumb screw to tighten up the strap.
It had one plug in wire and the info read out unit. It was made by MagnetoSpeed company.
Was wandering if anyone has seen this unit and would like to get any feedback on the operation and thoughts about the unit.
It sure was easy to set-up and get operating compared to my old Crony.
Tom
 
That is the magneto speed chrono
It is so simple to set up, not affected by light, accurate as any other on the market ( I have used Oehler 35P, Chrony, and PVM 21) (from reviews I have read), has been extensively reviewed, and gives U all the info you need. You are seeking bullet speeds. Thus the effect on point of impact of the bullet by the "receiver bayonet" fixed to the barrel is not important for the data you seek.

http://www.magnetospeed.com/
 
Chronographs

I own 4 chronographs and had two friends loan me their chronographs. We tested all 6 chronographs set up in a row less than 10 foot spread in distance from each other. They should be reading relative the same speed from the same shots. Shot a known 6BRX load with an established 6-9 fps extreme spread 3050-3041fps .

There was an extreme spread of 232 fps between the units. Ironicly the Ohler 35P(most expensive) and the Chrony (lest expensive) were within 35 fps of each other.

Had 3 CED machines set up and extreme spreads were 232 fps difference with one being 50 fps diffiierent from the slower CED. I used both white light and infrared screens with no difference in the readings just less errors when used under the trees.

The two Magneto speeds could not be used on simaltanous shots as only one could be on the barrel at a time. Successive loads fired over the Magneto Speeds indicated with in 25 fps of each other.

I am not sure how accurate chronographs really are the question is, are they consistant?

Just thought I would pass this along.

Nat Lambeth
 
Thanks Nat,good info,I think I will stick with my old Chrony for now. The ease of set-up is what interested me the most,and was looking for the accuracy feedback also. I did see that there may also be some concern about that thing hanging out on the end of the barrel.
Tom
 
Thanks for this Nat!

I have done similar testing but using three chronies, they agreed well. I have no idea whether or not they were absolutely accurate but they agreed within 10fps as far as relative speed.

Three in a row on a board

3 chronos.jpg

Generally the readouts were in descending order. I was surprised at how quickly the bullets were losing velocity.

al
 
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i use a three screen 35p.....it is easy to see decrease in speed between the second and third screen when the first screen is set at 10 or 12 feet and 2 and 3 are 2 and 4 feet furter out.
with three or four chrono's in a row i would expect to see lower speeds on each sucseeding chrono....

mike in co
 
I have a 35p and if the speed is 2fps different from screen 1 to screen 2 than between screen2 to 3 it comes up as an error. Rogina
 
YOU CAN ADJUST THE ACCEPTABLE DIFFERENCE.....
mike in co

rogina said:
I have a 35p and if the speed is 2fps different from screen 1 to screen 2 than between screen2 to 3 it comes up as an error. Rogina
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