Test event 1 : Bare gelatin
The gelatin block is bare and shot at a range of ten feet measured from the muzzle to the front of the block. This test event correlates FBI results with those being obtained by other researchers, few of whom shoot into anything other than bare gelatin. It is common to obtain the greatest expansion in this test. Round which do not meet the standards against bare gelatin tend to be unreliable in the more practical test events that follow.
Test event 2 : Heavy Clothing.
The gelatin block is covered with four layers of clothing: one layer of cotton T-shirt material ( 48 threads per inch) ; one layer of cotton shirt material (80 threads per inch); a 10 ounce down comforter in a cambric shell cover (232 threads per inch); and one layer of 13 ounces cotton denim (50 threads per inch). This simulates typical cold weather wear. The block is shot at then feet, measured from the muzzle to the front of the block.
Test event 3 : Steel obstacle.
Two pieces of 20 gauge, hot rolled steel with a galvanized finish are set three inches apart. The steel is six inch squares. The gelatin block is covered with Light Clothing and placed 18 inches behind the rear most piece of steel. The shot is made at a distance of 10 feet measured from the muzzle to the front of the first piece of steel. Light Clothing is one layer of the above described T-shirt material and one layer of the above described cotton shirt material, and is used as indicated in all subsequent test events.
The steel used as obstacle is the heaviest gauge steel commonly found in automobile doors. This test simulates the weakest part of a car door. In all car doors, there is an area, or areas , where the heaviest obstacle is nothing more than two pieces of 20 gauge steel.
Test event 4 : Wallboard obstacle.
Two pieces of half-inch standard gypsum board are set 3.5 inches apart. The pieces are six inches square. The gelatin block is covered with Light Clothing and placed 18 inches behind the rear most piece of gypsum. the shot is made at a distance of ten feet, measured from the muzzle to the front of the first piece of gypsum. This test event simulates a typical interior building wall.
Test event 5 : Plywood obstacle.
One pieces of three-quarter inch AA fir plywood is used. The piece is six inches square. The gelatin block is covered with Light Clothing and placed 18 inches behind the rear surface of the plywood. The shot is made at a distance of ten feet, measured from the muzzle to the front of the plywood. This test event simulates the resistance of typical wooden doors or construction timbers.
Test event 6 : Automobile glass
One pieces of A.S.I one-quarter inch laminated automobile safety glass measuring 15x18 inches is set at an angle of 45° to the horizontal. The line of the bore of the weapon is offset 15° to the side, resulting in a compound angle of impact for the bullet upon the glass. The gelatin block is covered with Light Clothing and placed 18 inches behind the glass. The shot is made at a distance of ten feet, measured from the muzzle to the center of the glass pane. This test event with its two angles simulates a shot taken at the driver of a car from the left front quarter of the vehicle and not direct in front of it.
The preliminary VBR-FBI-CRISAT test program.
Calibration of our ordinance gelatin blocks.