Have you written to S&W themselves? If they state that the guns may be unsafe with modern loads, that should weigh heavily in your favor.

The basic problem is that you live in a nanny state that's intolerant of firearms ownership. They'll probably twist anything they can to deny ownership.

The .38 S&W/.38-200 was the Australian military revolver round in WW II and for years after. That the ammo is now unavailable there shows the extent to which these anti-gun zealots have achieved their goals.