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Long Range Hunting & Shooting
Kestrel 5700 for hunting.
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<blockquote data-quote="LRNut" data-source="post: 2214920" data-attributes="member: 3230"><p>I used to live in northern MN and shot quite often at -30 (not long, as my trigger finger would freeze pretty quickly). I noticed my .220 Swift shooting 55 gr bullets would drop substantially more at 700 yards compared to a 7RM shooting higher BC bullets. That was my first lesson in dealing with temperature changes: shoot as high a BC as you can. I rebarreled my Swift so it would shoot 80-90 gr bullets and the difference dropped dramatically.</p><p></p><p>I thought some more about this topic this morning. If you shoot year round, the impacts of temperature are not very dramatic, simply because one summer or winter day is very likely similar to the others. More importantly, you can moderate temperature impacts fairly easily by establishing your zero in the middle of your temperature range. In the -20 to 80 spread you point out, 30 degrees means you would see a maximum temp change of 50 deg. On the other hand, it is difficult to establish a zero at 4000 feet if you live in Florida.</p></blockquote><p></p>
[QUOTE="LRNut, post: 2214920, member: 3230"] I used to live in northern MN and shot quite often at -30 (not long, as my trigger finger would freeze pretty quickly). I noticed my .220 Swift shooting 55 gr bullets would drop substantially more at 700 yards compared to a 7RM shooting higher BC bullets. That was my first lesson in dealing with temperature changes: shoot as high a BC as you can. I rebarreled my Swift so it would shoot 80-90 gr bullets and the difference dropped dramatically. I thought some more about this topic this morning. If you shoot year round, the impacts of temperature are not very dramatic, simply because one summer or winter day is very likely similar to the others. More importantly, you can moderate temperature impacts fairly easily by establishing your zero in the middle of your temperature range. In the -20 to 80 spread you point out, 30 degrees means you would see a maximum temp change of 50 deg. On the other hand, it is difficult to establish a zero at 4000 feet if you live in Florida. [/QUOTE]
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Kestrel 5700 for hunting.
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