I have listed below in tabular form various case stamps and their associated manufacturer. If you find any errors or would like to add to this list, email me at vikings@mebtel.net .
| MANUFACTURER | HEADSTAMPS |
| Federal Cartridge Co. | Rimfire : AL, EP, G, G, HP, F, XL, XR, WM Centerfire : FC |
| Newton Arms Co. | NA (+ caliber) (made by Rem.) |
| Peters Cartridge Company | Rimfire : P, PETERSHV Centerfire : P, PC, P.C., PCCO, PETERS |
| E. Remington & Sons | E. REMINGTOIN & SONS |
| Remington Arms Co. | U, UMC, REM, REM*UMC, R-P, RAH |
| Robin Hood Ammunition Co. | R, RHA, R.H.A. Co. |
| Savage Arms Co. | S.A. Co. (made by U.S. Cartridge Co.) |
| Richard Speer Mfg. Co. | SPEER WEATHERBY |
| Union Metallic Cartridge Co. | U, UMC, RB |
| United States Cartrideg Co. | US, U.S., *U.S. CARTRIDGE CO*, U.S.C. CO., RL |
| Western Cartridge Co. | SUPER x, SUPER-X, W, WCC, W.C. Co., WESTERN |
| Winchester | W, H, SUPER SPEED, W.C. Co. |
| Winchester-Western | W-W, super speed |
| MANUFACTURER | HEADSTAMPS |
| Allegheny Ordnance | KS |
| Dominion | DAQ |
| Denver Ordnance | DEN |
| Des Moines Ordnance | DM |
| Evansville Ordnance | ECS |
| Eau Claire Ordnance | EW |
| Frankford Arsenal | CF or F or FA |
| General Electric Co. | GE (+ date) |
| Israeli Military Industries | IMI |
| Lake City | LC |
| Lowell Ordnance | LM |
| Milwaukee Ordnance | M |
| Remington | RA |
| St. Louis | SL |
| Twin Cities | TW |
| Utah Ordnance | U or UT |
| Verdun (Canada) | VC |
| Western Cartridge Company | WCC |
| Winchester Repeating Arms | WRA |
Last updated : 03 April 1998