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"...What I would like to know first, though, is whether this method has been used to produce evidence that has been pivotal in the outcome of a case. It is all very well for me to be critical of a thing, but my observations might not be relevant if these measurements alone do not sway a case..."
"...More later, once I hear from you folk whether any cases have been made or broken by X-ray calibre determination as described to me by Evan Thompson and related again in Brian Heard's book..."
The second composite photo is of the known standards, as well as a measurement of one of those standards on an X-Ray, which not surprisingly measures smaller than the known standard. However, if done correctly, the questioned bullet in the same X-Ray would measure smaller as well.
The standards were held in the same plane (emphasis added) next to the questioned bullet. (Additional positional X-Rays may be needed.)
The questions you raise would need to be answered before a skeptical juror would (or should) accept an expert opinion.
Who asks the questions?