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Shooting Angle Adjustment

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 10:55
Tennessean View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: August/22/2007
Location: United States
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Points: 45
Hope my question is not in the wrong forum topic.  Most of my shooting is done on a homebuilt 200 yard range, with a downrange angle of maybe 10 to 15*.  If I'm zeroed in with this much decline, how might I expect my groups to shift (everything else being equal) if I shoot on a level range?  I'm having a hard time understanding how the level of the barrel might affect group shift.  The scope is a SS10x42, and cartridge is a .308 if it makes a difference.  Thanks in advance.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 11:07
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
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Points: 5087
need bc , velocity, bullet wt.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 12:13
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
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Lord Of The Flies

Joined: March/14/2007
Location: South Africa
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Shooting uphill or downhill causes less gravity pull. So if you have zeroed your rifle on a slope(uphill or downhill) your grouping will be lower when you shoot on a level range. I doubt however if a 10 to 15 degree slope is severe enough to cause much of an effect. I am sure Dale will be able to give you a more precise answer if you give him the ballistic info.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 14:44
Tennessean View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: August/22/2007
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Thanks, guys.  The ammo I most often shoot is 168 gr, 2650 ft/sec, and a bc of either .404 (hunting ammo) or .447 (target ammo).
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 15:11
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
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Points: 5087
here is los for 0 and -15
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 15:35
Tennessean View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: August/22/2007
Location: United States
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Points: 45
Wow!  Talk about fast response time and useful information.  Much appreciation.  It'll take me awhile to wrap my brain around all of that, but in short, it looks like I would expect the POI to shift .4 inches at 200 yards.  Am I reading that right?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2007 at 15:41
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
Location: United States
Status: Offline
Points: 5087
yes you are and thats with the higher bc- less than the width of the reticle probably, hardly even worth the worry.
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