Quote:
Originally Posted by libertyman777
Let me ask this.
Why does .223 brass used to make .300 Whisper brass need to have the necks turned down?
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Not all of it does. It completely depends on your chamber.
Older SSK chambers are a touch on the tight side and may require neck turning for chopped 223 brass to work.
There is such a thing as 300/221 and 300/223. They are two different calibers. The 300/223 is just a 223 necked up to 30 caliber.
However if you think you have a 300 Whisper chamber designed to work with cut down 223 brass, go ahead and use Redding 300/221 (aka Whisper) dies.
If this gun has not been built yet, ask your gunsmith *exactly* what case length you should trim to. If he says 1.350-1.400 than you have a Whisper chamber and you can use Whisper dies.