Greetings, Dr. WTS,
"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.
I read the same test and my take away was that enough of the pellets swapped sides to indicate random sideways directional velocity as the swarm separated (something like an equal number of rights on the left and lefts on the right), but in no sense a wholesale swap. IIRC, the author made a kinda half-hearted, weak case in support of his pre-determined conclusion.
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.
Unfortunately, as I indicated above, this is not at all "simple, horse sense" physics; Journee was wrong about inward momentum. The venturi principle is counter-intuitive; however, it is true science.
have a day
Dr.WtS
And a good day to you, sir.
DDA
