Carl,
Something out of the Armstrong Institute regarding chambered rounds:

Now that you mentioned having SigArms for a sidearm, I wanted to point out something that was recently discovered with LEs using Sig and Glock 9mm weapons.

In the article, LEs typically chambered the same round in the morning, and unloaded the same in the evening, only to reload the same round on the next duty day. What that tends to do to the round is constantly slam the bullet home when the slide goes forward, effectively changing the headspace. The LE in question recently had a catastrophic failure that Sig nor Glock will guarantee as a weapon's failure. The round exploded inside the chamber sending half the slide and some of the bullet down range, but the LE escaped unhurt.

Practice 'top round' rotation and mark them so that you know just how many times the round has been chambered.

This assumes you're chambering a round with the start of your duty day, and clearing the weapon at the end.

If you folks are sharing weapons, this may be significant as each person ends up chambering and clearing a round each day.

If anyone is interested in the article, please send me a PM.

Regards, Stan