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From what I understand, 300/221 is the same thing as .300 Whisper - SSK has the Whisper name copyrighted.
I've used brass from both .221 Fireball (loaded and formed brass from Reid's Ammo) and Lake City brass (formed brass from SSK and loaded ammo from CorBon).
Both seemed to work just fine.
I believe the SSK barrels have a slightly wider chamber at the neck so you don't have to ream the necks when you resize military brass.
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