Many Ballistic test have been performed over the years. Most containing some type of bias in one form or another. Whether you choose to believe the FBI tests, Local PD test, Historical accounts or Gun magazines, we strongly suggest you sit down with our Coaches and Instructors for a discussion on the many variables that affect terminal ballistics. Modern controlled expansion ammunition is affected by many things such as, clothing types, glass, drywall, sheet metal, etc. Full Metal Jacketed ammunition, such as that used for target shooting and the Military are affected different. Cost, availability, comfort and shooter performance all have effects on the reason an individual or agency selects a caliber. Ego and marketing have no place in the personal protection field. Here at Guardian Training Center, we remove the ego and marketing to give you just the facts.
source