Highly unusual. They are normally highly responsive and helpful.
That said, while I don't have a 300 Norma (or it's improved cousin), I do have other improved calibers. Since the shoulder is in the same place, you use the same pilots as the standard case of the same caliber.
Examples: For my 6 BRA, it uses the #10 pilots - same as the 6 BR. For my upcoming 338 Improved, it uses the #37 pilot - same as the 338 LM.
That said, it's my verbose way of getting to the point that they list the 300 Norma Improved on their site - it's further down the list from the 300 Norma. It is pilot #67 - same as the standard 300 Norma.