Not enough info, but it is probably shooter related. Vertical is usually a sign of breathing, horizontal is usually a sign of trigger control, grip, sling position, or resting point.
Posted: 1/18/2009 3:05:04 PM EDT
[#3]
At greater ranges, it could be due to variable cross-winds.
Posted: 1/18/2009 3:32:06 PM EDT
[#4]
could be rcvr/stock weld as well ie your bolts could be loose
Posted: 1/19/2009 8:47:53 AM EDT
[#5]
Most common
Breathing, hold you breath at the natural pause
Bedding of the barrel to the stock..... The screws may be bottoming out if they are then you are making a pressure point on the barrel take off a few threads.
