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Old 02-15-2011, 08:06 PM
fritz1's Avatar
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Join Date: Dec 2010
Location: Idaho
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I have a question.

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I know that the 222 has been necked up to a 243 caliber for benchrest shooting, called a 6mmx47 or something like that. My question is, has anybody ever necked up the 223 to a 243? If so what is it called, and how does it perform?
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Old 02-15-2011, 09:00 PM
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Posts: 155
The 6mm/223 is also known as the 6x45mm. That is about all I know about it. The 6mm TCU is also made by necking up the 223, but it is .010" shorter and has a sharper (40 degree) sholder. It was made for the T/C contender, and is a pretty good varmint cartidge. I'm not sure what the metric designation of the 6mm/222 is. Mabey someone else will come along with more info. Hope this helps,Ron.
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Old 02-16-2011, 03:43 AM
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6x47 is the .222 Mag necked up to 6mm. Not the .222. Just a clarification.

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Old 02-16-2011, 06:57 PM
fritz1's Avatar
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Originally Posted by MikeG View Post
6x47 is the .222 Mag necked up to 6mm. Not the .222. Just a clarification.
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