Nice to see someone use correct terminology.....in this case ‘bullet resistant’. As we all should know, bullet resistant, water proof, etc., are just funny terms😊Underwriters Laboratories rates bullet-resistant qualities of glass, assigning ratings ranging from UL-1 to UL-8. As one might guess, UL-1 doesn't offer much protection, whereas UL-8 will stop some pretty heavy rounds.
All bets are off though when dangerous African game cartridges, .50 caliber rounds, etc., enter the picture. 6.5 Creedmore at close range is quite impactful...I'd expect it to go through almost all glass rated as bullet resistant. Not absolutely all, but most.