« Reply #1 on: February 09, 2012, 04:52:05 PM »
If it is like other IHMSA headstamp brass then I suspect it is federal brass. They ran a bunch of brass back in the day for IHMSA in various calibers. Here is an old post. I have seen some one time before at a gun show and didn't grab them. Wish I had.
http://www.gboreloaded.com/forums/index.php?topic=209945.0
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