Quote:
Originally Posted by Hoser
If you are using an older SSK Industries barrel, you might need to use 221 brass.
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How old is "old"? I've got an SSK barrel that I bought 7 or 8 years ago. The only 5.56 brass that it won't chamber also won't chamber in my Noveske .300FB barrel. (and I forget what headstamp it was. Something foreign, anyway.)
But any U.S. 5.56/.223 brass has always been just fine in either chamber.