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Deep groove in carabiner?
I recently rappelled a ~150' rappel (1st one of that day) on single strand using a fairly new Black Diamond Rocklock aluminum carabiner attached to my ATC. I weigh ~220 lbs., and the rappel was fairly slow and controlled. When I completed the rappel, I noticed the fairly deep groove in my carabiner, which made be a little bit worried about using an aluminum carabiner as my main carabiner for rappel. I usually do a double strand rappel, and never had anything close to this.
1. Is this normal???
2. I'm considering switching for a steel carabiner for my main ATC carabiner (~x3 weight DMM Steel BOA HMS)...any opinion?