That is why I tried out a scope cam 4K and used my head cam at the weekend the scope cam is a piece of junk do not buy terrible images and sound. Every one get a gopro hero 8 black or spend a grand on a camera scope if you want to see a BB at long distance. I have very good scopes I used with full bore rifles but they would be wasted on airsoft.
If someone made a good gun mounted zoom in camera BB proof for airsoft with good sound and video I WOULD BUY IT! Not if it is PLASTIC.
A gopro is there to prove to people you are taking your hits as well as showing when they do not take theirs but as you say distance hides a bb and frequently a clear picture of the player you are trying to hit. I was surprised the first time I range tested with a friend how poor my (perfect hopped AEGs) were distance wise 350 FPS has its limits. A DMR on 450 FPS with the right weight BBs does help but people forget their engagement distances and always seem to try for head shots and that is when people get hurt. On Sunday at a distance of 5 or 6 feet I shot a player body shot as he came around a corner he was dead but he still fired at me after being shot, I took the hit and walked.