Fired at the muzzle, a representative 6.5 Creedmoor load (9.1 g, BTHP, 800 m/s) reaches roughly 62 mm (2.5 inches) into polycarbonate. That is enough to defeat a typical barrier of this material — treat anything behind it as exposed.
About Polycarbonate
A polycarbonate pane (~12 mm); true bullet-resistant glass is far thicker and layered.