Welcome to Chronographer!
As an avid handloader and shooter, I got tired of always having to manually transcribe my chronograph readings, then re-enter them into Excel to perform the calculations. At first, I built a serial cable so I could at least collect the data without writing. Now I have finally taken the time to sit down and bang out the code necessary to not only save the data, but to perform and display the real-time statistics.
I hope you find this as useful as I have.