Fired at the muzzle, a representative 6.5 Creedmoor load (9.1 g, BTHP, 800 m/s) reaches roughly 20 mm (0.8 inches) into dyneema uhmwpe. That is enough to defeat a typical barrier of this material — treat anything behind it as exposed.
About Dyneema UHMWPE
UHMWPE armor (~6 mm), a modern lightweight ballistic laminate.