Working through the details...

[too_many_hobbies]

Originally Posted by too_many_hobbies

The chronograph displaying about 100 fps too slow and the speed of sound being on the high side at 1139 fps today with the 80 degree temperatures would seem to explain this discrepancy.

I sent my chronograph to the manufacturer for calibration. I am going to wait till I get it back before I continue searching for an accurate subsonic load. I wish I had purchased an Oehler Model 35 (discontinued) with the 3 screens instead of the ProChrono Digital.