I used one yesterday. What a great tool.
http://www.magnetospeed.com/
I've been fumbling with a crappy chrono for years now, and I'm half tempted to throw that thing in the trash. I checked my precision .223 load yesterday and got significantly different results from what I'd gotten with my Shooting Chrony. The new data fits perfectly with what I've observed at the range, namely needing a little more elevation than my dope said I should need. The Magnetospeed showed my MV to be 2,600fps, SD=9. That was for 8 shots. My Shooting Chrony had been giving averages of 2,660 and SD's more like 15.
The owner of this Magnetospeed also has an Ohler 35P. Next time I go out, I'll shoot through both simultaneously and get some comparative data.
It's actually easier to use with a suppressor, but it works either way. The best part is that I get to use it without having to own it.





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