TexasCHLforum.com

Bullet setback isn't the only potential issue with repeated chambering and ejecting of the same round. The extractor will nick the case rim with each cycle and it's possible to reach the point where the round may not eject reliably. If you run your finger around a round that's been through several cycles, you'll easily feel the rim damage.

I put the rounds in my practice batch after about 5 cycles just to be sure. An FTE is a very bad thing after the first round in a firefight.