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Rifles, Reloading, Optics, Equipment
Equipment Discussions
Cabela's Brunton Summit weather station
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<blockquote data-quote="Buffalobob" data-source="post: 343707" data-attributes="member: 8"><p>For my 257 Wby when elk hunting on the Manti in Utah I had a drop chart set up for 7000 feet altitude and wound up hunting right on top at 9000 feet. The altitude correction factor was 0.25 MOA per 1000 ft. at a range of 1000 yards. So for one thousand yards at 9000 feet I need 0.5 MOA less drop to be dialed in. The shot I finally took was only 450 yards which is only half of 1000 yards therefore I needed only one click to be taken off the drop. </p><p></p><p>The drop chart was set up for 50 degrees but it was cold with slushy snow on the ground so I estimated it to be just below freezing. The correction factor for temperature for that rifle and load is 0.1 MOA for every 10 degrees at 1000 yards. So with it being colder by 20 degrees and the air more dense I needed to add 0.2 MOA to my drop chart at 1000 yards. The shot was only 450 yards so I only needed to add half of that to the required drops.</p><p></p><p>Now the higher altitude requires MOA to be subtracted and the colder temperature required drops to be added. End result was I needed less than one click on the scope to compensate for the total changed conditions.</p><p></p><p>If the shot had been for 1000 yards, my total would have been -0.5 MOA +0.2 MOA = -0.3 MOA i.e. take off one click!!!</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 343707, member: 8"] For my 257 Wby when elk hunting on the Manti in Utah I had a drop chart set up for 7000 feet altitude and wound up hunting right on top at 9000 feet. The altitude correction factor was 0.25 MOA per 1000 ft. at a range of 1000 yards. So for one thousand yards at 9000 feet I need 0.5 MOA less drop to be dialed in. The shot I finally took was only 450 yards which is only half of 1000 yards therefore I needed only one click to be taken off the drop. The drop chart was set up for 50 degrees but it was cold with slushy snow on the ground so I estimated it to be just below freezing. The correction factor for temperature for that rifle and load is 0.1 MOA for every 10 degrees at 1000 yards. So with it being colder by 20 degrees and the air more dense I needed to add 0.2 MOA to my drop chart at 1000 yards. The shot was only 450 yards so I only needed to add half of that to the required drops. Now the higher altitude requires MOA to be subtracted and the colder temperature required drops to be added. End result was I needed less than one click on the scope to compensate for the total changed conditions. If the shot had been for 1000 yards, my total would have been -0.5 MOA +0.2 MOA = -0.3 MOA i.e. take off one click!!! [/QUOTE]
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Cabela's Brunton Summit weather station
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