Sometimes the caliber information is either spelled out or abbreviated 30-06; 38 SPL, 11, Not a manfuacturer 's code, but rather a load identification code used by . F DE M, abrica Nacional de Municiones, Santa Fe, Mexico near Mexico .A headstamp is the markings on the bottom of a cartridge case designed for a firearm. It usually They can be identified by the light-blue sealant used on the primer annulus. The symbols on the lower arc of the stamp indicates the caliber 7.7mm, 5.56mm or 7.62mm and R# or R#M# indicate the model R and mark M .M = Milwaukee Ordnance Plant - Milwaukee, Wisconsin. The headstamps shown below do not reflect all of the .50 caliber casings that were made during WWII .Welcome to the AFTE Headstamp Guide. We are always taking new submissions for inclusion in the HSG. If you would like to contribute, please visit our Forum .
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