Back in the 40s, 50s & 60s, .32 acp caliber rounds were very common, especially foreign ammo. intended for the Walthers and other semi autos made in Europe. I had cases of that ammo., bought very cheaply at the time, which gave me the opportunity to fire 1,000s of rounds in various .32 cal auto pistols, including the Model 1913 S&W. Most of it was FMJ and probably didn't help the bore in those guns, but did help the ammo to feed nicely. None of the various makes of the ammo. gave me any problems in the S&Ws, that I recall, and it was common knowledge among shooters to use .32 cap in the .35 auto Model 1913s. Ed.