I am surprised that anyone gets any answer at all from the factories. In the U.S., I have never been successful at getting answers to questions like that unless I had a personal friend with the company. You have to be some “well-known” hack gun writer from the popular gun press to get any answer at all, or with LE and even then, if not an “official” call, it helps to know someone at the factory.
It is odd that the industry is relatively scornful of collectors, when it is obvious from all the ridiculous loads they bring out that the are, in a sense, pandering to them, and the fact that probably about 85% of the relatively to very accuract cartridge research and literature is the work of collectors, not the industry or the government. In articles I have written, I have seldom gone to Government or Industry sources, other than printed matter which is often inaccurate, for research. Other collectors have been the best and most-used source, both with their knowledge, and pursuing avenues of research that I either had not thought of or could not find.
So, it is not a surprise that some factories, even though they are willing to make an answer, give conflicting information. I had that experience with the industry in Switzerland over a 9 x 23 headstamp from Thun that was found in Spain and presumed to be “Toledo,” but had such Swiss characteristics, that I did a lot of contacting in that country. I was originally told by three different industry sources that they had never made such a caliber, but then found a friend in a gun club in Trevaux that knew about them, and thanks to Frank N., from this Forum and a personal friend as well, put me on to a Lady in the Swiss industry who had all the answers that none of the men could or would provide.