

How to identify reloads in purchased once fired brass
Got some 9mm brass from gun broker, advertised as once fired but never 100%
I found these and the red marks made me think reloads
What else should I be looking for when filtering this brass in any way?
Plan on loading 125 grain lead/powder coated bullets with pistol power to a good plinking power (no +p)
With a handful of guns to feed them into.