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Old October 10, 2012, 10:06 PM   #12
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 36,307
Found the reference.

Huon's Military Rifle and Machine Gun Cartridges indicates that in 1932 the ball N was adopted and had black, purple, our green primer annulus.

While he doesn't specifically say those colors were used only on ball N, the only mention of primer annulus colors is in reference to the ball N.
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Last edited by Mike Irwin; October 11, 2012 at 05:18 AM.
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