I had considered that relativity of time, hence why for the longest time I thought it was me.
However, most times when I'm doing something such as flying or fighting etc, I'm not stopping to start a recorder.
I may have to record FRAPS on film viewer files to break down the individual frames of bullets on that P-39D example, then break down the exact firing time "live" and compare the two. That should be a good indicator, right?
I'm also a bit miffed that some older films are all broken. I didn't have a fast enough system to really make decent AH videos before now, and now all my footage is useless!