Western Field shotshell may have just "Western" on the brass, while the same type of shell may also be marked "Western Field" on another base).
Dating remington cartridge boxes
For other manufactures, the A or B has represented the powder (Smokeless or not).
Also keep in mind, that in some cases, the Letter can actually represent an alternate gauge.
An example is a 20A UMC shell that has been found to actually be the rare 18 Gauge shell.
The 20A also exists in greater quantities in the 18 Gauge.
MTM Case-Gard™ is family owned and operated since 1968.
MTM strives to be innovative in our approach to the shooting sports.For example, the "Winchester" only headstamp is used on Winchester Standard loads, Winchester Magnum Loads, Winchester Duck and Pheasant Loads and various other Winchester shot shells as well as shells loaded by many different companies.It is therefore important to note what is written on the shell casing itself (either on the top wad or written on the casing) to aid in the identification of the shell.Shells may be made with Black Powder or smokeless powder.The casing may be paper, plastic or Metal (usually brass or Aluminum).In the late 1960's, the original RS-S-50 was designed specifically for bench rest shooters.