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temp and altitude?

 
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Old 05-07-2008, 08:15 PM
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Join Date: Nov 2007
Location: SW Michigan
Posts: 65
temp and altitude?

I live in south west Michigan where is flat. I am wondering hoe much temp and altitude effect poi. If I sight in my 300rum with a 200gr. accubond and retumbo powder and I dont plan on shooting at an animal past 7or 800 yds. I found a farmer who let me build a dirt mound and now I can shoot to 950yds. I am shooting twice a week 10 rds each day in the 300rum and 40-50 in the 17hmr. I am keeping 5" 10 shot group at 500yds and getting better. I know there is lots of room for improvement but Im still practcing.
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Old 05-09-2008, 05:19 PM
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Join Date: Jul 2007
Location: Arkansas (Home of Record)
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Go to JBM's ballistic web page and punch in different numbers and see for yourself. Can make a hell of a difference when you go from one extreme to another, especially when you change both at the same time.
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