Hacker15e, Steel is harder than brass. Chambers are steel and if your cases are steel there has to be some increased wear over the course of thousands of rounds between brass and steel. I do machine work for a living, I can cut or machine steel with steel, but if I try to use brass for tooling it will do nothing to steel. Just seems like the steel case going into the chamber, expanding during firing then more friction based wear as it is extracted my "guess" is that steel will wear a chamber, extractors/ejectors much quicker than brass. How many rounds for it to be of any significance, I don't know, but I choose to use brass for my brass. I would be interested to see if there is any scientific research on this subject. If I am wrong would like to see the data proving it.