Not sure if this should go in GD or not, but there’s some evidence that there was more than one gunman.
Acoustic evidence is one of the things which points to Oswald as being the killer in the case of JFK. If the rest of the information in the article is correct, then it seems likely that someone else was shooting at the same time. Were they trying to shoot Sirhan?
Another take on whether this is really scientific evidence. It’s not.
It’s pretty certain that Sirhan Sirhan shot Robert Kennedy, since it happened in a crowded kitchen, where Sirhan was taken down with the gun still in his hand, in front of a bunch of witnesses.
Could there have been a second shooter? Where did the shots go?
Off the top of my head: I think one of the “magic bullet” theories about the RFK assassination was the presence of extra bullet holes (somewhere), and the angle at which they would have had to come (not from SS’s gun). I saw a program some years ago that went into that, and pretty much debunked the extra bullet hole idea. I think that the upshot was that early in the investigation they had been thought to have been bullet holes, but further research showed it was not the case. I don’t think there’s anything credible other than Sirhan Sirhan acting alone alone.