Security levels for bullet-resistant systems have been established by UL (Underwriters Laboratory), the primary testing organization for materials used in these systems. Each level has been tested and found effective at stopping certain types of projectiles, ones most typically employed during an armed robbery. While ratings extend to Level 8, the needs of most banks, credit unions, and convenience stores are well covered in Levels 1-3.
| Ratings | Ammunition | Weight | (g) | Velocity Min FPS | Velocity Max FPS | Velocity MPS | No. of Shots |
| Level 1 | 9mm Full Metal Copper Jacket with Lead Core | 124 grains | 8.00 | 1175 | 1293 | 358 | 3 |
| Leve 2 | .357 Magnum Jacketed Lead Soft Point | 158 grains | 10.20 | 1250 | 1375 | 385 | 3 |
| Level 3 | .44 Magnum Lead Semi-Wadcutter Gas Checked | 240 grains | 15.60 | 1350 | 1485 | 411 | 3 |
| Level 4 | .30 Caliber Rifle Lead Core Soft Point (.30-06 Caliber) | 180 grains | 11.70 | 2540 | 2794 | 774 | 1 |
| Level 5 | 7.62mm Rifle Lead Core Full Metal Copper Jacket, Military Ball (.308 Caliber) | 150 grains | 9.70 | 2750 | 3025 | 838 | 1 |
| Level 6 | 9mm Full Metal Copper Jacket with Lead Core | 124 grains | 8.00 | 1400 | 1540 | 427 | 5 |
| Level 7 | 5.56mm Rifle Full Metal Copper Jacket with Lead Core (.223 Caliber) | 55 grains | 3.56 | 3080 | 3388 | 939 | 5 |
| Level 8 | 7.62 Rifle Lead Core Full Metal Copper Jacket, Military Ball (.308 Caliber) | 150 grains | 9.70 | 2750 | 3025 | 838 | 5 |
| Supplementary Shotgun | 12-Gauge Rifled Lead Slug | 1 oz. | 28.30 | 1585 | 1744 | 483 | 3 |
| Supplementary Shotgun | 12-Guage 00 Lead Buckshot (12 pellets) | 1.5 oz. | 42.00 | 1200 | 1320 | 366 | 3 |
