As above you might see one before the other.

Flattened primers, but then again I bought some factory ammo that flattened the primers
more than I would load them. Along with that Cratering.
and hard bolt lift.
Actually hard bolt lift is the first thing that causes me to take a really close look at everything.

Brass flow is a real good one. Swipe marks if you have an automatic.

Case head expansion is another solid indicator.

Primer peircing, its too late and or
Case head separation, close to disaster.