OzFclass

Any idea if you can get a chrony chronagraph calibrated and where if you can.

Good question. I don't know of any that are available as a service. I find that simply lining several different "field grade" chronos in series gives a good sanity check. The Magnetospeeds and LabRadar are the ones I have the most respect for, because most others are affected by light levels.

Yeh, I've had it up against a Labrador, that's how I found out it's about 100 fps slow. I bought it through a bloke in WA a few years ago because he offered services here in Australia. But as usual, now that I want to use the service, I can't find the contact or purchase details.

From what I've discovered, it is as easy to correlate results & field shooting against a reliable ballistics program. I'm happy with my 15 plus years old Oehler 35 for the information I use from it & mostly that's to identify whether on not loads have an acceptable extreme spread supported by SD.

Magnetospeeds are not for me because I can't fit them around a Shadetree tuner & Labradars are beyond my price range - relative to a good annealer, for example.