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Old 01-30-2008, 05:16 PM
WrzWaldo WrzWaldo is offline
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Join Date: May 2007
Location: Northwest Washington (The State)
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Using a simple Greenhill calculator (based on length to diameter ratio) you would need a 1:7 to shoot the 90. A 1:8 for the 75 and 80. It is a bit more involved with the design of those bullets, but that should be a good starting reference.
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