A beautiful Mauser, but I guess I need more slivovitz to keep up with this thread. Since my Polski is weak, I fed your posts through the Google Translation Sausage Maker, and this is what came out the other end:
<Jagermeister> "Mr. Ryszard This rifle is not jewelry. Unfortunately, even after rozszezeniu neck to the scale of 7.62x63 9mm will not fit into the chamber barrel caliber 9x63."
<Ryszard> "In the book "The Home Guide Cartrege Conversions" describes how to produce ammunition for this caliber. Lord sends an E-mail a copy of pages of this book. Sam did this league and I know that it is possible. When, therefore, it can shoot 35 rounds Whelen, which as we know the scale of 30.6 in May from the ball 0357. 35 Whelen cartridge is weaker than 9 x 63 because takes less dust. 9 x 63 has a shorter neck than the 35 Whelen."
Cheers,
Peconga