Dear friends, I am new here so excuse me if I didn't get the appropriate place to ask: I use an old Walter Olimpia pistol but my barrel got broken so I have to repair it. I cut off the chamber and I am going to replace it with a hand made one. I shaped it ruffly but here comes the problem - in fine shaping. I never shaped a chamber before so I don't know exactly what kind of tools I need to use and what order of steps. As far as I read in some forums, there are several types of reamers (for example - "Long Rifle Bentz", "Bentz" only, "Long Rifle Match", etc.) but I am not sure which exactly I need to use in this case. May you help me with any advices? Thank you in advance!