*Similar brand brass provides a more consistent shot placement because the gilding metal used varies from brand to brand. The harder the gilding metal, the more energy is taken to fire form the brass to fit the chamber. This has a minimal output effect on the muzzle energy but at distance any difference can be a big difference.
9mm Winchester brand brass has no crimp around the primer pocket
These cases come from indoor or outdoor 'covered' ranges and may have minor dings, dents or slight imperfections and flaws which can be easily removed upon resizing or will be 'shot out' upon the first firing.
These cases have been used and so are sold 'as-is'.