I went thru a lot with 4" 9mm guns as we were trying to find a good cast bullet load. Seemed like no 4" gun liked them, however the Artillery and Navy models would shoot them. Send one gun to Lugerdoc, who shot it (with factory ammo I'm sure) and he sent it back as good to go. Still wouldn't shoot the cast bullet loads but would run with S&B 115 fmj.
Then I switched all my loads to 115 FMJ (back when you could still find them...) and all has been well since.
It seems to have been an issue of pressure and sufficient recoil that made the difference, however the same load/powder was used in both instances.
So to make a long story shorter, it was the ammo for me that made the difference. The right ammo and even my 4" Lugers have become quite reliable.
And I am now forced to go back to cast bullets, so the circle of frustration begins once again.
dju
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