While your point is well taken, remember that the headstamp info provided on this relatively brief listing is only a guide. You are absolutely correct that “Without the proper context of the headstamp information, it’s value is lessened.” Obviously some crooks or idiots will selectively use bits of information to misidentify ammunition they are selling.
A complete list to cover every possible headstamp marking is probably an impossible goal.
Recommendations for corrections or additionas are welcome, and will be considered for inclusion in a future update.
Meanwhile- People need to read the caution at the top of the list:
“Manufacturer (or in some cases the maker of the cartridge case, or distributor of the loaded ammunition, or a using activity, or other meaning. See Note 1 above *)”
and NOTE 1 which reads:
"*Note 1- Headstamps often contain multiple pieces of information. The maker is almost always identified. Military ammunition usually includes date information, and civilian ammunition often has caliber information. Sometimes dates are fairly obvious (44 = 1944; 72 = 1972; 6 12 = June 1912, etc.). Sometimes the caliber information is either spelled out or abbreviated (30-06; 38 SPL, etc.) and other times, such as on German made DWM ammunition, a catalog number code is used for the caliber. Sometimes information on the headstamp indicates the type of load (VII Z on .303 British indicates Mark VII ball ammunition loaded with nitrocellulose powder.) Sometimes markings are deliberately deceiving, as with some .30 carbine ammunition ammunition marked LC 52, made by the Chinese, or .30-06 marked B N 4 40 made in the U.S., both probably intended to arm allies while hiding their source of supplies. Sometimes the headstamp only indicates the maker of the cartridge case, or distributor of the loaded cartridge, or the using activity, not the actual “manufacturer” of a loaded cartridge.
Even collectors with years of experience and extensive reference libraries end up with a few cartridges they cannot identify, so don’t feel bad if you cannot identify everything."