Pour confirmer ce qui vient d'être écrit, en replongeant dans des documents anciens, je lis notamment (sans toutefois jamais être tombé sur des documents spécifiant la valeur de l'alésage) :
"...
The Swiss Army pistol ammunition is the Pistolen Patrone 41, made by RUAG.
This 124gr FMJ 9x19mm round comes in 24 rounds boxes, which suffice to load 3 magazines.
Like the RUAG rifle ammunition, it has replaced its original nickel alloy bullet jacket with a jacket made of copper.
...
The Pistolen Patrone 41 was originally produced for the M49.
...
It is a high-pressure combat round, accurate albeit not optimized for target shooting.
..."
plus loin :
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Barrels with rifling specially designed for lead bullets are available...the standard barrel twist rate of the P210 is too fast to stabilize lead bullets.
..."