Reloading questions - Trimming

[Evil_EdwardO]

Is trimming 9mm brass necessary? Does anyone measure the case length? Do you measure all or just a sample if you do? Seeing what the general consensus is here. I'm about to reload some twice fired 9mm brass and didn't trim the first time around reloading.

[Stein]

I never trim or measure 9 mm brass.  No need whatsoever and I couldn't imagine sitting down to trim 1,000 pieces.

[theleo]

If your 9's are getting to long to operate leave them lay and pick up the guys brass that's blasting away with factory ammo he just bought.

[300rum]

You don't need to trim 9mm.  I shoot my brass until it fails, usually from a split in the case mouth.  You may want to case gauge the rounds using your chamber when reliability is important.