Notice I did not say that no targets are broken by one pellet. I said I was certain that we all get one pellet breaks occasionally. Shooting a target with a pellet gun proves nothing, however. Targets in the air are more likely to break, due to centrifugal force helping the targets come apart when cracked. If you could hit a flying target with an air rifle shooting a single #8 lead pellet it might prove something.
And, not having read Jones' work completely I am only commenting on what those here who have done so have said ........ but, if finding that the majority of the load is in the central core is the most important thing to come from his work, I'd have to offer that he did an awful lot of work for a little benefit. Anybody who has ever looked at a shotgun pattern on paper or a grease plate can plainly see that.
SRH