Correct on all points.
When the definition of SEMI AUTO mattered in classifying firearms, the government legislated a definition.
When the definition of HANDGUN mattered in classifying firearms, the government legislated a definition.
When the procedure for measuring a handgun barrel mattered in classifying handguns, the government legislated a measurement process.
There can be no certainty until either the government legislates a process for measure bores, or a judge creates one.
In being asked to create one, a bunch of options will be suggested by the crown and the defense. The defense will rely on PAST RCMP practice and guidance, which is consistent with CURRENT CBSA practice. The crown may rely on the CURRENT RCMP policy which was adopted within hours of the Public Safety Minister tweeting admonishments at the RCMP via twitter.
Regardless of what the judge rules, clearly the changing of the process which has significant legal consequences which jeopardize the liberty of millions of Canadians should not be so arbitrary as to be vulnerable to abrupt changes based on Bliar's Twitter Tantrums.
Ultimately, until a judge settles this for all, by either striking down the offending section of the regulations, or creating a legal standard for measuring bores, we simply can not know the classification of these firearms. Remember, these regulations were not crafted by technical experts in order to capture certain firearms within the prohibited class. They were crafted by idiot politicians in order to capture the votes of other idiots in Toronto and Montreal.
Once you accept that all firearms ownership is an act prohibited by law, it gets a lot easier to simply not know the answer to some of these questions.
