I'd have to agree with horse1 on this topic, even though I choose to run a Benelli every time. The Benelli will get slowed down by cold weather before a Beretta will, given equal maintenance.
What I've done is to forget about the weak spring in the Benelli so that it can run light loads, as all my hunting loads are 1 1/8 ounce or heavier at high velocities whether lead or steel. As such, it is simple to put in a Wolff extra power spring in the buttstock and get more spring power for closing without beating the gun up on the back end.
Equipped that way, I'll take the inertia action every time, as I have found them far more tolerant of dry dust than a Beretta or Browning. Dry dust from field goose hunting is what I've seen shut down more autos than anything wet or cold. Always on the return stroke, not closing all the way.
