fwiw,
I do... Or rather I have in years past, however, my Oehler 35P was such an onerous PITA to setup that it never got used. In short I just sold it for about half of what it was worth and I am going to wait to see if LabRadar or the Canadian kid who came up with the www.autotrickler.com has also come up with a super simple two box chronograph. That said, at this point, I am definitely from Missouri, and they are going to have to show me which, why, and how... Magnetto does not tolerate suppressor heat all that well though you have to love the portability component. Hoping they will come out with a LabRadar V.2 that addresses .22 caliber and smaller projectiles...

Same Canadian has come up with a Chrono that is supposed to be super accurate. It can't get much simpler short of wet ground...
http://www.autotrickler.com/twoboxchrono.html

Regards, Matt.

NRA Life Benefactor Member