They work. Just like 9mm in a 40sw mag for a glock. Tested myself. Only failure to load i ever had was doing a mag dump.
If you line up your shots. You are fine. If you are trying to unload the rounds as fast as possible. You will get feeding issue. I had atleast 2 a mag when trying to unload as fast as possible.
Never had a issue when i stayed on target and trying to get the best groupings possible.
Above poster is right. Self defense. Big no. For your range toy which ever canadian falls into. A big yes
I have some p320 40sw mags coming today. I plan to go out sometime this week to test them out in my new p320x5. I message you back with the details