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| Model or Mark | M, MK |
| Magazine | mag |
| Magnum | Mag |
| Metal Case | MC |
| Metal Case Open Point Expanding | MCOPE |
| Metal Cased Wad Cutter | MCWC |
| Muzzle Energy | ME |
| Millimeters | mm |
| Minute of Angle | MOA |
| Modified (choke) | Mod |
| Metal Point | MP |
| Mid Range Trajectory | MRT |
| Muzzle Velocity | MV |
| North Atlantic Treaty Organization | NATO |
| National Rifle Association | NRA |
| National Reloading Manufacturers Association | NRMA |
| National Skeet Shooting Association | NSSA |
| National Shooting Sports Foundation | NSSF |
| Open Point Expanding | OPE |
| Over/Under | o/u |
| Pounds per square inch | PSI (Incorrect) |
| Pounds per square inch | psi |
| Pounds per square inch | lb/in2(Correct) |
| Pointed Soft Point | PSP |
| Right Hand | RH |
| Rimfire | RF |
| Rimfire Magnum | RFM |
| Rounds | Rds |
| Round Nose | RN |
| Round nose Lead | RNL |
| Semi-Wad Cutter | SWC |
| Semi-Wad Cutter Lead | SWCL |
| Semi Wad Cutter Hollow Point | SWCHP |
| Semi-Jacket, Soft Point | SJSP |
| Semi-Jacket, Hollow Point | SJHP |
| Semi-Jacket, Wad Cutter | SJWC |
| Short (type of rimfire cartridge) | S |
| Side-by-Side | SxS |
| Single action | SA |
| Sporting Arms and Ammunition Manufacturers' Institute, Inc. | SAAMI |
| Solid Lead | SL |
| Soft Point | SP |
| Sporting Rifle Powder | SR |
| Shotshell | SS |
| Standard Velocity | SV |
| Truncated Cone Hollow Point | TCHP |
| Velocity | VEL |
| Muzzle Velocity | Vo |
| Wad Cutter | WC |
| Wildlife Management Institute | WMI |