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Old 01-06-2007, 03:46 AM
montdoug montdoug is offline
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Join Date: Sep 2006
Location: Bozeman Montana
Posts: 6,164
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Welcome to the site, sorry it took so long for someone to respond. My .20 VarTarg has a 22 inch barrel and my working load is 3,785ish or close enough to 3,800 it makes no difference. I could possibly go faster but there's no need.
While I'm not a gun smith I can't see the .221 case needing more than a 22to max 24 inch barrel to get maximum velocity out of any round using it. At a certain point there becomes a situation of diminishing returns and it's going to go the other direction and start slowing down.
If more velocity is a big concern build a .20 Tactical or something similar. Keep us posted.
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montdoug
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