25 m CF calibre?

[Spencer]

...Apart from that, there's no statement of a precise limit of energy for defining "magnum" in the rules, so it will be forever a question of judge's criteria...

Yes, but!
- it's still the ammunition loading, not the chambering that is covered in the rules
- even a standard load in a 9mm parabellum (which is not a 'magnum' load) gives a mighty, and very noticable 'crack' in comparison with CF target loads - and no serious shooter of ISSF would use anything even that heavy a loading.

...Do you really think that the moments previous to a match are the appropiate for starting an argument with the range officers regarding equipment???
.

certainly not

Maybe our AUS range officers and equipment control personnel for ISSF events are better trained? A firearm chambered for .357 Magnum and presented for ISSF CF at equipment control will not raise an eyebrow.

[renzo]

You're absolutely right on both points.

I was trying to answer the question in the OP.

As for me, I used a long time a S & W K-38, then changed it for a Sig P-240 in .32 S & W L, so I've never had to "tempt the devil" with my equipment!!!!