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30/221 (whisper) barrel length?

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Unread 02-11-2008, 11:06 PM
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Location: MS
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30/221 (whisper) barrel length?

Not exactly a long range gun caliber but I decided to build a .30/221 (300 Whisper). I plan on shooting the 200+ class of bullets and understand that I need a 8 twist barrel to stabilize these as subsonic speeds? Since I am threading a supressor on the muzzle (assuming I get approved by the ATF) what would be a suitable barrel length? Can I get by with a 16 inch barrel or should I go longer?
I admit that I know just enough to be dangerous.....but dangerous at ever extending distances.
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