Guys,
Watching bullet trace is something done as a matter of course in an Across the Course Highpower match. When spotting and scoring for a shooter at the 600 line you can watch trace on every shot. After a while you get good enough to predict where the spotter will be even before the target comes back up with the proof.
Watching the trace arc way up high into the target image then come back down toward the middle where it ends gives you a good appreciation of the real trajectory our rifle bullets have.
In a Highpower Team Match, where coaching is allowed in the 200 and 300 yard rapid fire events, the coach sets his scope up directly behind and over the shooters position. By watching trace he can yell out feedback on the location of each rapid fire shot to the shooter as he's firing.
Best regards,
Swampy
Garands forever