I'd like to try using new brass for my 9mm, I've always used my own from once fired factory ammo. Other than higher cost, what are the advantages of using new brass versus once fired brass. Also, what are the differences between standard brass and +P. Are there any positives or negatives for using +P brass over standard brass assuming they are both new and made by the same manufacturer. For what it's worth, I'm using a Dillon XL650 with Dillon carbide dies.
Thanks in advance!