nevada
Senior Member
Steel cases (which are a mix of steel and copper jacket) will wear out your barrel faster. Lucky gunner did a test.
This isn't a huge issue for pistols, rifles are a different animal due to the much greater forces involved.
http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/
how can barrel wear be caused by the CASE? that would be a projectile issue.
chamber, and extractor wear I can see being possible, but barrel? not seeing it.