out of curiosity I was tryng to figure out which pistol, of any brand, would have the most rounds. No special configuration, no exotic rare pistol, no super long clip, just a close to factory configuration.
17+1, as indicated in lead article, is about it as far as stock factory norm goes. Beyond that you get into squishyness of floorplates, long mags, or anemic rounds (ex.: .17HMR). These are not “exotic” or “special”, but do strain the limits of practical/normal choices.
—for a long time it was the FN-manufactured Browning of about 1935 , commonly known as the Hi-Power (improperly,IIRC) which was the one where John Browning upgraded and corrected the 1911 model-—
That would be the FN Five seveN.
My XDM .40 has 16+1, and the 9 mm has 19+1 with the normal magazines.