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Old December 11, 2017, 08:53   #34
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Join Date: Oct 2002
Location: NY transplant to central Illinois, Now in Kentucky
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Originally Posted by Texas Jaguar View Post
300 Blackout and 300 whisper are both based on the Remington .221 brass case expanded from .224 to .308. According to Hornady they are interchangeable with one another.
Yes, but most all brass in use today is made from once fired LC 5.56.
You can DIY, but their are a bunch that convert and sell as ready to load brass for about a dime a rd...which when you figure brass, tooling and time, is really hard to beat...
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