Just listened to the latest news story on the CDC shooting. According to the story, approximately 180 rounds of (I guess 223/556) were fired from the CVS across the street (maybe less than 300 yards) into the buildings. Only 4 to 6 rounds actually penetrated the glass windows. Was it the distance ? Was it the type glass ? Was it the bullet design ? Or perhaps that was typical/normal for all considered. I am always interested in learning something new. Thanks.

