Note: Exact Shotgun Cartridge Identification requires the identification of both the headstamp, primer and the shell case.
Many companies, such as Winchester may only place a "Winchester" headstamp on the cartridge base for various models of shot shells which are very different from each other.
The contents of the shell is also of great importance to proper identification.
Sometimes the contents are marked, other times not.
The color of the plastic or paper hull as well as the case size and the size of the brass rim must also be taken in to consideration for identification purposes, as well as the color, size and type of primer used.
Primer size, color, type and size have changed over the years and can sometimes give an idea to the age of a shell.
The historic documents appear here and a recent trip report here. This is world class unique engineering beyond stunning.
AKA the Incredibly spectacular prehistoric ag structures.
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.
A recent scientific experiment here verified that if you are going to blow the top off a mesa, it might end up suboptimal to be standing on the mesa at the time.
NEW: Hanging Canal AZ Lafayette Story NEW: Little Known Gila Hikes Slide Show! These are very easy to rig -- just push the bolts in with your thumb.