Before anyone has a heart attack, let me explain. Patterns sweep out a trumpet shaped volume. Choke effect controls how quickly the pattern spreads radially; a plot of forward velocity vs sideways (radial) velocity rotated makes the trumpet shape. So, if you look at two patterns from widely differing chokes and shot at the distances where the patterns have equal diameter, you will find the patterns are indistinguishable.
Don, here's what Brister says about patterns in his chapter on "Choosing Chokes and Loads":
"The improved cylinder pattern, which exposes a higher percentage of its pellets to atmospheric resistance at the muzzle, spreads faster and in more direct ratio to distance. Gough Thomas explains this by suggesting that the full choke stays tight, then spreads out suddenly, something like the bell of a trumpet, while improved cylinder spreads out as a rather constant cone. My wife, after a particularly tiring day replacing test targets and tabulating data, suggested: 'Just tell them improved cylinder goes to hell gradually; full choke all at once.'"
I don't think there's any disagreement to the more open chokes spreading faster. That's what they're designed to do. But there appears to be some disagreement on the trumpet shape issue--full having a narrow tube that rather suddenly transitions to a wide mouth, while IC has a wider tube with a more gradual transition to its mouth. Are you (and Jones) suggesting that the profile of IC and full patterns are actually the same in terms of how quickly they transition from the trumpet's tube to its mouth?
