[lentulusgracchus]

All the cartridges should show the same amount of bullet exposed above the case mouth, discard any short rounds.

Is this true for .380 also?

[xsrdx]

Is this true for .380 also?

Yes, but keep in mind this is only true for the exact same type of cartridge.

Different bullet weights and styles will have slightly different seating depths and OAL (overall length), so you can't draw any conclusions comparing (hypothetically) 125gr Federal JHP to 130gr Remington FMJ, for instance.