Came into some "new, never fired" primed 45 brass. It's R-P stamped (Remington), large primer. Based on the condition of some of the cases it's been sitting around for awhile. I've never purchased new brass or primed brass for that matter but it was a good deal on ~1600 pieces.
These cases have a "patterned indent" about 3/4 of the way from the bottom. Not sure what I'm looking at, nothing I've deal with before. Again, I'm typically reloading 1x commercial brass or range pickups. Apologies if this turn out to be a stupid question...but ya don't know what ya don't know
Attached some pics, hoping someone can shed some light on it.
Also, some of these are not looking so great...any harm in giving primed brass a quick tumble ? I know some people do this after reloading lubed cases (I do not) so I'm pretty sure I'm on solid ground but wanted to double check.
Thanks.