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Unread 03-26-2011, 01:32 PM
Silver Member
Join Date: May 2009
Location: Prosperity, Pa
Posts: 254
Re: temp

For a high BC bullet( 7mm , 6.5-284) at 1000yards 40 degrees cooler will result in the POI being about 7 inches LOW. At 750 yards the difference would be 2 inches LOW and there would be very little difference from 500 yards down. 40 degrees temperature change is almost identical to a 2000 foot change in elevation so yes they can cancel each other out. They must be in opposite directions to cancel out .
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Unread 03-27-2011, 06:21 PM
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Join Date: Dec 2008
Location: rathdrum, id.
Posts: 5,260
Re: temp

Originally Posted by 375fan View Post
If you zero at 80 degrees and temp drops to 40, same altitude, bullet will be lower. As far as shooting at 40 degrees at higher altitude, I'd be interested to know if thinner air compensates for cooler temp.
It does all else being equal. I use 500' elev. = 10 degrees temp at about 1000 yds......Rich
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