Anybody ever seen horizontal cuts on 9mm brass like this before? There's almost always a corresponding dent on the case a little higher up towards the mouth, a little further around the case to the right (the dent looks similar to the dent you get in .223 cases from an AR's case deflector. But the location of this dent relative to the scratch varies a bit. You can see the dent well on the 1st, 3rd, and 4th cases from the left). This is range pick-up, not my brass. But I see these regularly. They drive me nuts because who-ever is shooting these likes to shoot Federal, which is my head-stamp of choice (FC). It gets frustrating having to cull 1/4 to 1/3 of the scavenged brass I find in my favorite headstamp, lol (I often don't notice it until after I've cleaned up the cases, or I wouldn't pick them up in the first place). I'm just curious what this might be caused by. Is this common with 9mm AR's or something like that? It looks ejection-related to me, but I'm no expert. Thanks!