After WW1 there was much development on improving the accuracy of 30-06 ammunition. Starting in 1921, special head stamps were being used by both Frankfort Arsenal and civilian manufactures on their cartridges. The boat tail bullet and the M1 cartridge was also a result. Later most 30 cal was stamped with the NM but before that time many unique headstamps were used and few have survived for collectors.
Some examples in my photos: I & P was Frankfort Arsenals loading for International Match and Palma Match, the Rem-UMC was a special 300 & 500 yard cartridge and the R on a headstamp indicated annealed case
Some examples in my photos: I & P was Frankfort Arsenals loading for International Match and Palma Match, the Rem-UMC was a special 300 & 500 yard cartridge and the R on a headstamp indicated annealed case
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