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Old June 3, 2009, 05:42 PM   #13
AMX
Senior Member
 
Join Date: July 22, 2005
Posts: 126
I used the JBM ballistic calculator at www.eskimo.com to see the difference between a 25y zero, a 25 meter zero (Army), and a 50 yard zero.

The ammo is M193 .243 BC at 3,165fps.

.....25y.................50y ...................25m
25y....0.0.........25y......-1.2...........25m....0.0
50y....2.4.........50y........0.0...........50m....2.3
75y....4.5........75y.........0.9.............75m....4.3
100y..6.4......100y........1.6............100m...6.1
125y..7.9......125y........2.0............125m...7.4
150y...9.2......150y.......2.1............150m...8.4
175y.10.2......175y.......1.9............175m...9.0
200y..10.8.....200y.......1.3............200m...9.1
225y...11.0....225y........0.3............225m..8.8
250y...10.8.....250y.....-1.0............250m..7.9
275y...10.2......275y.....-2.8............275m..6.5
300y.... 9.1......300y......-5.1...........300m..4.5
325y.... 7.5.......325y.....-7.9............325m.1.8
350y.....5.3.......350y....-11.2...........350m-1.6

This is why I suggest 50 yard zero's on AR/M16's.

Edit- There, that's a little better.

Last edited by AMX; June 4, 2009 at 04:26 PM.
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