I just pumped out 500 rounds of 9x19mm. I found some brass to avoid. The head stamp is WMA 17. It is a military type of brass with crimp, but even after I removed the crimp the primer pocket is too small. If one really felt the need to make it work, one could use a tool for uniforming the primer pocket, I suppose. I just tossed them. Looks like this ammo is Winchester made in Oxford, Mississippi. If you are buying factory ammo and want to keep the empty brass for reloading, I'd avoid this.