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  1. 8

    Chamber dimension of GP-100

    What size should the chambers of a .357 be at the forcing cone end? I have a GP-100 of 1988 vintage. I cleaned my cylinder thoroughly with Bore-Clean and a .40 size brass brush on an electric drill. Then I tried to pass a .357" diameter plated bullet through the chambers. I could push the...
  2. 8

    Chamber diameter - GP100

    I measured the end of the chambers on my GP-100 and noticed that the diameters were about .355". I couldn't make a 9mm plated bullet go through the chamber without stopping. I load .358" lead bullets and .357" plateds. Would this chamber size affect performance or accuracy? It seems...
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