I am convinced that I know choke constriction changes the rate of spread of patterns. I am convinced that I know that X-post wads make spreader loads that undo choke constriction. Beyond that, I'm not sure I know what affects patterns and what not. My work to date shows that patterns must be treated statistically to avoid conclusions based on insufficiuent data. Right now, I don't have the time to do the kind of work necessary to analyze definitive numbers of patterns. Dr. Andrew Jones has given us a very powerful pattern analysis tool, but, even so, it takes more time than I have right now.
Shot hardness, plating, buffer, forcing cone profile, choke constriction profile, powder burn rate, peak pressure, wad cushioning and sealing, various spreader materials, ----!???! So many questions. So much shooting and analysis needed for real answers.