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Possible POSITIVE error on my Nikon 4-16x50

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/06/2009 at 17:45
Southernfryedyankee View Drop Down
Optics GrassHopper
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Joined: June/05/2009
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I just eye bore sighted my rifle at approx 25-30 yds to get the crosshairs to match up with my bore at a specific target. Nikons website states this scope has 40 MOA internal adjustment but after going through all the clicks I had after eye sighting I have an additional 44 clicks up elevation to shoot at further targets and an additional 15 clicks down elevation which brings me closer to 60 MOA elevation. I would imagine that is a good thing right or did I possibly do something wrong. I have not tested the windage adjustment to see if it the same. Have companies been known to make errors like this before. I DID buy my scope from a reputable Nikon dealer. This is from Nikons website. If this is a mistake on their part I am very happy. What kind of range can I get with a 7mm rem mag 140g TSX with 43+- MOA
 
 
Actual Magnification 4x-16x
Effective Objective Diameter 50mm
Exit Pupil (mm) 12.5-3.1
Eye Relief (in.) 4.0-3.7
FOV at 100 yds (ft.) 25.2-6.3
Tube Diameter 1 in. (25.4mm)
Objective O.D. (mm/in) 57.3/2.26
Eyepiece O.D. (mm/in) 44/1.73
Length (in) 14.7
Weight (oz) 19.4
Adjustment Graduation (1 click) 1/4 MOA
Max Internal Adjustment 40 MOA
Parallax setting (yds) 50 - ∞
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/06/2009 at 18:07
Urimaginaryfrnd View Drop Down
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Joined: June/20/2005
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http://www.eskimo.com/~jbm/cgi-bin/jbmtraj-5.0.cgi  Here you go plug in the balistic coeffecient of the bullets etc and  have fun.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/06/2009 at 18:09
Southernfryedyankee View Drop Down
Optics GrassHopper
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Someone else referred me to that website and I didnt know how to use it. I will study it a little harder and try to figure it out. Any opinions about my other issue
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/06/2009 at 18:33
Southernfryedyankee View Drop Down
Optics GrassHopper
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IIIIIIIIIF I actually did this right which I may have been off on a few things (elevation, scope height, avg temperature, zero elevation etc etc), this was the table I was given
 
The load is a black hills 140g barnes TSX 7mm rem mag
velocity 3150, energy 3084
B.C .394
 
Does that sound possible?
 
 
150 -2.0 -0.5 0.0 0.0 2789.5 2.484 2418.5 0.152 0.0 0.0
200 -5.2 -1.3 0.0 0.0 2675.7 2.383 2225.1 0.207 0.0 0.0
250 -9.1 -2.2 0.0 0.0 2564.7 2.284 2044.4 0.264 0.0 0.0
300 -13.5 -3.2 0.0 0.0 2456.4 2.188 1875.4 0.324 0.0 0.0
350 -18.2 -4.4 0.0 0.0 2350.7 2.093 1717.5 0.386 0.0 0.0
400 -23.4 -5.6 0.0 0.0 2247.6 2.002 1570.2 0.451 0.0 0.0
450 -28.9 -6.9 0.0 0.0 2147.0 1.912 1432.8 0.520 0.0 0.0
500 -34.8 -8.3 0.0 0.0 2049.0 1.825 1304.9 0.591 0.0 0.0
550 -41.2 -9.8 0.0 0.0 1953.7 1.740 1186.4 0.666 0.0 0.0
600 -48.0 -11.5 0.0 0.0 1861.2 1.657 1076.7 0.745 0.0 0.0
650 -55.3 -13.2 0.0 0.0 1771.7 1.578 975.6 0.828 0.0 0.0
700 -63.2 -15.1 0.0 0.0 1685.4 1.501 882.9 0.914 0.0 0.0
750 -71.6 -17.1 0.0 0.0 1602.6 1.427 798.3 1.006 0.0 0.0
800 -80.7 -19.3 0.0 0.0 1523.6 1.357 721.5 1.102 0.0 0.0
850 -90.5 -21.6 0.0 0.0 1448.7 1.290 652.3 1.203 0.0 0.0
900 -101.0 -24.1 0.0 0.0 1378.3 1.227 590.4 1.309 0.0 0.0
950 -112.3 -26.8 0.0 0.0 1312.8 1.169 535.7 1.420 0.0 0.0
1000 -124.6 -29.7 0.0 0.0 1252.7 1.116 487.8 1.537 0.0 0.0
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/06/2009 at 19:54
Oldtrader3 View Drop Down
Optics Journeyman
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I would take these tables with a grain of salt until you can chronograph the Black Hills ammunition.  The 7mm Mag published ballistics are usually somewhat optimistic on velocity.  Plus most riflemen sight-in their 7mm Mags at 200 yards.  Then with these adjusted numbers, drop, velocity and energy figures become more relevent.
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