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Probably the best explanation is that the steel case does not contract as much nor as quickly as a brass case so when the bolt tries to pull out the case before the case has fully contracted, there is a lot of resistance. With the extractor being the weakest link, it gives and chips the thin edge. As Kevin points out, there are fewer problems if the chamber is completely clean and there are no rough spots. As the chamber gets dirty, resistance to the extraction becomes greater and damage can occur. (not really a jr. member. Better known as jimb16)
I have often wondered were you went to sir ?Glad to see ya back ;)
 
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