10-03-2017, 01:57 AM
Reading some of ther recent posts, especially the ones by LR55, reminded me that the zero "drift" from session to session might be a manifestation of the true dispersion of one's rifle, especially if calm winds are present for each session.
On average, a 3 - 5 shot group is much smaller than 10 or 20 shot group given the same intrinsic dispersion. Most of us don't want to 'waste' ammo on 20 or 30 shot groups, especially when all those 'flyers' make the group much bigger.
Add to this changes in wind, temperature and light and the group grows slightly more.
That is why I advocate multiple trips to the range using the same zero for all of them. Then set the sights to capture the composite group center.
Next look at the composite group size and extend it to the range where it would be about the size of the vital zone of interest. That defines the maximum tange where one should attempt a shot under conditions similar to what were seen on the range over the multiple trips.
If the winds ere stronger than seen on the range, don't attempt the shot unless you have confidence in your doping and offset.
On average, a 3 - 5 shot group is much smaller than 10 or 20 shot group given the same intrinsic dispersion. Most of us don't want to 'waste' ammo on 20 or 30 shot groups, especially when all those 'flyers' make the group much bigger.
Add to this changes in wind, temperature and light and the group grows slightly more.
That is why I advocate multiple trips to the range using the same zero for all of them. Then set the sights to capture the composite group center.
Next look at the composite group size and extend it to the range where it would be about the size of the vital zone of interest. That defines the maximum tange where one should attempt a shot under conditions similar to what were seen on the range over the multiple trips.
If the winds ere stronger than seen on the range, don't attempt the shot unless you have confidence in your doping and offset.
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"To those who have fought and almost died for it, freedom has a flavor the protected will never know."
-- Author Unknown
"If at first you do succeed, try not to look astonished!" -- Milton Berle