What information does a headstamp on ammunition provide?

The headstamp on ammunition provides essential information that includes both the caliber or gauge and the manufacturer identification. This marking is typically found on the base of the cartridge case and serves multiple purposes.

First, the caliber or gauge is crucial for ensuring that the ammunition is compatible with the firearm it is used in. Each firearm is designed to accept specific calibers, and using the wrong one can lead to dangerous malfunctions. Secondly, the manufacturer's identification helps in tracing the source of the ammunition, which can be important for accountability, safety recalls, and legal reasons.

While other options suggest important details regarding ammunition, they do not accurately represent the primary function of the headstamp. The headstamp does not indicate the total weight of the ammunition, the date of manufacture, or the type of powder used, making the identification of caliber and manufacturer its most relevant and practical information.