I have received no definitive answer as to why a double cannelure was used on this head stamped "RA 59" .308 NATO ( cross in circle) round. It is magnetic. The cannelures are knurled. I purchased a lot of interesting WW1 dated .30 cal 1906 at auction, 18 of these were included. I am puzzled as two US militaria forums I posted did not know. Your thoughts appreciated...( if nothing special, I will use it up at the range).
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