Winchester Reloading Brass is manufactured to extremely tight tolerances to ensure smooth feeding and positive chambering. Consistent case-to-case weight and capacity delivers outstanding accuracy. Winchester's high quality, durable brass can be reloaded several times. This is true 5.56x45mm mil-spec, new, unfired, heavy duty brass with a Lake City headstamp. It is the same brass used to load ammunition supplied to our fighting forces and offers outstanding performance in AR-15 type rifles. This is not loaded ammunition. Brass Preparation: With bulk rifle brass you may sometimes notice a few case mouths are "out of round" or slightly dented below the shoulder. These imperfections occur in the final tumbling wash operation after the case mouth has been annealed. Brass manufacturers are aware of the case cosmetics and have worked to mitigate it, but due to equipment design, denting may still occur. Minor dents are normally removed in the first firing and will not affect case life or ...