Headstamp

[1] Military cartridges have the manufacturer's head stamp at 12 o’clock, and can include a two or four digit year.

Operates several state arsenals that produce weapons and munitions for both the military and civilian markets.

Makes the Big Star rimfire and China Sports centerfire ammunition brands.

This was due to the fact that the military surplus ammunition couldn't pass the "magnet test".

The NORINCO copper-plated steel-jacketed Full Metal Jacket bullets would be attracted by a magnet – making it hard to distinguish between compliant lead-core and non-compliant steel-cored ammunition.

The larger versions of the symbol has the numbers ٧٢ ("27") inset in the circle split by the vertical line.

The "TO" is found on the base of shotgun shells, which Military Factory 27 makes for the civilian hunting market.

The 'Big Four' formed a group that cut out any arms companies they saw as a potential threat (like Savage and Western).

The packaging usually has the manufacturer code, 2-digit year, and a lot number on it so bad or suspect batches can be removed.

The left cartridge's headstamp says "FC 223 REM" which means that it was made by Federal Cartridge Co. and it is in the caliber ".223 Remington". The cartridge on the right has a headstamp that says "LC 99" with a symbol that consists of a cross in a circle. This cartridge was made in 1999 by the Lake City Army Ammunition Plant , in Independence, Missouri , USA. The symbol on this headstamp means it meets NATO specifications.
Cartridge base with a headstamp by Hirtenberger
RWS headstamp on an 8×68mm S rifle cartridge