IIRC..... it's been awhile.........................

It was written on the internet so it must be true...........

SAS when they were still carrying the Browning Hi-Power ....... only carried with 12 or 13 in the gun including the one in the chamber.....for "better reliability"...........

Truth or fiction....................I don't know.

See Federali's comments.........

I generally carry full mag +1 in Beretta's Sigs and S&W 3rd Gen with factory magazines ....... or Mec-gar magazines which in hi-caps are +2 over factory.