Perhaps it's a deliberate technique so that the spent cases can be retained and not to leave forensic evidence at the scene, other than the bullets themselves.
After this, you would want to run a drill through the barrel to permanently destroy the rifling so that no forensic match could be made to the gun.
Someone on X said they found shells at the scene.
This had to be a hit and a well thought out one. I heard this guy was up to his eyeballs in corruption and mostl likely pharma jews wanted him gone.
That’s what I think