Mark II, this is a very good question. I don't have an exacting, unrefutible answer, however, I will post some data summations that are very close to what you asked. Anyone remotely interested in patterns must read "Sporting Shotgun Performance" by Dr. Andrew Jones. It is, IMO, the only source of statistically valid pattern data, including my own.
First fact to understand - patterns are all the same except for bloom time/distance. That is to say, a full choke pattern at forty yards will be the same as a cyl pattern at some shorter yardage.
Per Dr. Jones, the difference among pattern diameters of various shot load weights from a 12 bore is basically trivial.
Per Dr. Jones, the difference among pattern diameters of various shot load weights from various bore guns is small and basically trivial.
The book does not present data that directly answers your question, but the statistical validity of the data makes the extension reasonable.
Questions?
DDA
Last edited by Rocketman; 04/03/16 07:18 PM.
