Wow man! I've had issues with the .355 fmj's that didn't have enough meat for a good crimp, where the truncated .357 sig bullets (Speer I believe) had an elongated flat area toward the base for a better crimp.Bull****, the projectiles are the same diameter. Nosler clearly states that their 9mm bullets are suitable for both 9mm and 357 Sig. Once again you have no idea what you are talking about.
Just trying to pass along some hard learned tips.