I don’t believe the reliability issue was in the function, especially with a necked down case. I think that many of the high volume shooters were causing mechanical issues with the metal inserts in the polymer frame. It’s, as you know, a fairly snappy round. The only other Glock I can think of chambered in something of similar mojo is the 10mm, and I don’t think those, as a rule, see as much shooting volume.
NMSP tends to hire fairly husky individuals given the lack of backup they can expect, there are several 1 officer posts that cover close to 1000 square miles. They also are the ones that get sent into little towns when the local cops either all quit or are overwhelmed. They tend to like bombproof guns. They carried S&W 4506’s for a long time, a boat anchor yes, but plenty robust.
Of course, my opinion is suspect ‘cause I’m a big .38 Super fan. :)
I can see a high round count with .357SIG causing more maintenance issues than might be acceptable to a department, motivating a switch to a heavier gun.
.38 super rocks. i’m still hoping sig decides to start making their 1911 with an .38super option.