I didn't hear this info...I learned it!
9x23 should never be fired in a gun chambered for Largo because of the huge differences in pressure. The cases are externally, mirror images, but internally the 9x23 is much stronger as necessary to contain the pressure when fired in a 1911 with a non-ramped barrel.
Most Largo rounds are loaded too long for a 1911's magazine. A few rounds will fit, but as the rounds start arcing in the mag they stick.
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