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Long Range Hunting & Shooting
Elevation effects on bullet trajectory
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<blockquote data-quote="LRNut" data-source="post: 2132181" data-attributes="member: 3230"><p>I have the BR2 and the SIG 2400. I live in both Arizona and CO; my Colorado place is 8750; I am there now and shoot at gongs several times daily. The SIG does correct for elevation pretty darn well. At 715 yards my change is about 1 MOA less elevation; I don't know what it is at 905 because I go from 860 to 1200 in Arizona.</p><p></p><p>As for temperature, I am it total disagreement with the effects of temperature. In the past two months I have shot at temps from -4 to 42 and I don't recall having to move more than one click, if at all. It seems (gut feel here) that shooting in temps over 100 at ranges over 1000 yards you do need to adjust, but certainly not as much as your gunsmith recommends.</p><p></p><p>I know I haven't bothered to let my SIG sit outside to register the temp; it just doesn't matter, at least out to 905 yards. A bigger affect is aerodynamic jump, which the SIG compensates for but the BR2 does not (nor does it compensate for spin drift, which makes a bigger difference at 900 yards than temperature does IMO). My last shot today was at a 715 yard gong; the wind was blowing about 20 mph but at an angle; my SIG said 2 MOA windage (based on my input) but said come down one click from the day before (wind was from the right). I hit 2" right of center; perfect elevation.</p><p></p><p>One problem I have with the SIG and BR2 in Phoenix is overheating - if they sit in the sun they will heat up and think it is hotter than it is; why the BR2 is black is beyond me; horrible idea - the old Ranging monocular coincidence rangefinder (I am dating myself) was black too and would heat up and give bad results; painting it white really helped that problem.</p></blockquote><p></p>
[QUOTE="LRNut, post: 2132181, member: 3230"] I have the BR2 and the SIG 2400. I live in both Arizona and CO; my Colorado place is 8750; I am there now and shoot at gongs several times daily. The SIG does correct for elevation pretty darn well. At 715 yards my change is about 1 MOA less elevation; I don't know what it is at 905 because I go from 860 to 1200 in Arizona. As for temperature, I am it total disagreement with the effects of temperature. In the past two months I have shot at temps from -4 to 42 and I don't recall having to move more than one click, if at all. It seems (gut feel here) that shooting in temps over 100 at ranges over 1000 yards you do need to adjust, but certainly not as much as your gunsmith recommends. I know I haven't bothered to let my SIG sit outside to register the temp; it just doesn't matter, at least out to 905 yards. A bigger affect is aerodynamic jump, which the SIG compensates for but the BR2 does not (nor does it compensate for spin drift, which makes a bigger difference at 900 yards than temperature does IMO). My last shot today was at a 715 yard gong; the wind was blowing about 20 mph but at an angle; my SIG said 2 MOA windage (based on my input) but said come down one click from the day before (wind was from the right). I hit 2" right of center; perfect elevation. One problem I have with the SIG and BR2 in Phoenix is overheating - if they sit in the sun they will heat up and think it is hotter than it is; why the BR2 is black is beyond me; horrible idea - the old Ranging monocular coincidence rangefinder (I am dating myself) was black too and would heat up and give bad results; painting it white really helped that problem. [/QUOTE]
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