308 balistic question

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[ARCHIVED THREAD] - 308 balistic question

Posted: 10/17/2004 3:40:48 PM EDT

What are the balistics of a 762 51 surplus round out of a L1A1????
If I zero it at 25 yards, where will it go at 100, 200 and 300.
Should I be zeroing it elsewhere?

Posted: 10/17/2004 4:52:46 PM EDT

[#1]

Assuming:
sight-above bore 1.8"
2700fps
about 0.400 BC


 _BC_ _MV_         0      50     100     150     200     250     300 | YARDS
0.400 2700 >   -1.72    1.51    3.49    4.05    3.07    0.38   -4.08 | > 150gr FMJ
                2698    2587    2477    2370    2268    2166    2069 | fps, velocity
                Far zero at 255.9, maximum 4.06 at 144.4, falling -0.11"/yd,  angle 0.00217 rad

With a 50yd zero


 _BC_ _MV_         0      50     100     150     200     250     300 | YARDS
0.400 2700 >   -1.75    0.01    0.50   -0.45   -2.89   -7.08  -13.00 | > 150gr FMJ
                2698    2587    2477    2370    2268    2166    2069 | fps, velocity
                Far zero at 135.6, maximum 0.51 at 93.0, falling -0.14"/yd,  angle 0.00134 rad

You should really zero it at 200 meters and then use the marks on the rear sight.

Posted: 10/17/2004 5:01:39 PM EDT

[#2]

rear sies a bit flimsy...wouldn't count on it. flip up flip down kind.

[ARCHIVED THREAD] - 308 balistic question

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