Wind Effects on Vertical Spread

These are scanned images of the actual targets shot by me in a benchrest competition with a 6MMBR in Phoenix at the 1997 Nationals with the barrel tuned with the Accurizer for the load used. The wind conditions were to say the least, very challenging. They show the effects wind deflection on vertical spread. The first target was shot at 100 yards and the second at 200 yards. My inability to properly read the wind, is the reason for the large horizontial spread of the groups. Each of the bullets that dropped low were cause by a sighting error by me. These targets should dispel any myths about the detrimental effects of vertical accuracy caused by windy situations. The vertical spread of the 100 yard 5 shot group is 0.111" (0.111 MOA) with 4 of the 5 into a 0.014" group (0.014 MOA). The vertical spread of the 200 yard 5 shot group was 0.269" (0.140 MOA) with 4 of the 5 into a 0.101" (.05 MOA). I maintain that "Any vertical spread in a group caused by wind is insignificant." Vertical spread can be caused by: mirage, inconsistent sighting, or gun handling, improperly tuned barrel harmonics or load, and "extreme" velocity variations, especially noticeable over long distances, or of course shooting into a trailing or following "hurricane".


Wind Caused Vertical? The Definitive Answer!

Click the link above to read the in depth discussion that I had with the world renowned ballistics expert Rupert Nennstiel