A comment was made on another thread about seeing the ball/bullet travelling from the gun. Here is a pic which was totally unplanned (taken from video clip) of my .577 cannon in full voice. I don@t know to this day what caused the tracer effect and have repeatedly tried to do it again with no success.

https://i.postimg.cc/xjpTHBK1/Long18-tracer.jpgupload an image