I love 940s
I have 3 of them. I bought my first one about three decades ago
I eventually opened up my chambers for 38SUPER. Obviously since auto loader ammunition fired in most revolvers utilizes moon clips to headspace, all of the shorter cartridges can still be chambered.
So these revolvers are capable of chambering and safely shooting 38SUPER, 38ACP, 9x21, 9MM Parabellum, 380ACP and others that do not come to mind.
356 TSW can also be chambered in this revolver but it is not safe to fire it. 356 TSW operates at 50,000 PSI and the Model 940 is not capable of containing that kind of pressure
the 356 TSW cartridge was chambered in the Performance Center Model 940 Special, these little powerhouses were quickly nicknamed
"The Pocket Rocket". The changes that the Performance Center made to the frame is part of what the first J-Magnum revolvers possible just 2 years later
I like these little revolvers so much that I had Bell Charter Oak make one of their NY Reload holsters for me