According to one guy doing the audio analysis said the high velocity gun came towards Trump.
We do not know exactly what any of the weapons that were analyzed were. There are some indications of Crooks weapon being an AR type, most common would be .223 and 55gr FMJ bullet.
There is speculation about the SS sniper rifles (.308, .338, and mention of 300 Win Mag). High velocity means speed, not speed related to weight.
The FBI has the evidence and has turned congressmen away from the site. Told them to leave.
The FBI will determine it was a single shooter event. I am confident of that, but I don’t believe that is true for a moment.