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The posters above have done a fine job answering the focus of your question.
The short answer to the general question is more important with modern rifle rounds than with mid-pressure ones like .357 Mag.
Some brass really is stronger than other brass. I once had some Philippino .223 that was noticably softer than USGI brass. In one rifle, the extractor rim would be yanked and tweaked bad enough to make it jam in the shellholder when reloading it. It was *safe* to contain the chamber pressures for at least three firings (maybe many more...), but was demonstrably weaker than other brands with either harder alloy mix or more work-hardening of the casehead area.
Even an AR-15 would dent the brass and even totally collapse the case mouths on ejection sometimes.
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