Steel is for chrome plated chambers and bores.
Use brass case rounds.
If you want shoot cheap, shoot Lake City ss109 or get some American Eagle ss855’s. Look at Sportsman Guide or Cheaper than dirt for deals. $370 - $400 per 1000.
Leave all Russian ammo in the box. Why buy a nice AR then why shoot junk in it. Get a spray can of CLP and spray your bolt carrier. Makes it easier to clean, when you get home.