"Further, IMO, the reduced internal pressure of the shot swarm is the reason the pellets stay closer together. That is, they have less pellet-to-pellet pressure and less force to cause "spring-apart" and the entrapped air has less pressure to cause sideways velocity as the air expands on muzzle exit."
No - the pellets are radially accelerated towards bore center by the action of the choke. Rem, IIRC, also tracked pellet migration across the pattern by laborious assembly and recovery of multicolored pellets in designated sectors of the load. Read that when I was a kid so it was a LONG time ago. But a perfectly expected result considering the simple physics of the choke/charge situation.
have a day
Dr.WtS
