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How much wind does it take?
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<blockquote data-quote="Greyfox" data-source="post: 1423545" data-attributes="member: 10291"><p>Wind drift is about the ballistic coefficient and velocity which establishes the dwell time for the wind to drift the bullet. Weight is not the determinant. Just turns out that the heavy for caliber bullets generally have higher BC's then the lighter bullets. A 300gr bullet from a 338 Lapua and a 140gr in a 6.5 Creedmoor, both staring out at 2800 FPS with identical BC's will have comparable wind drift characteristics. I have experienced this with my shooting out 1000+ yards in a constant speed/direction of wind. </p><p></p><p>IMO, without sophisticated methods, it is virtually impossible to predict the exact effect of the wind for a given shot, particularly at the longer ranges. Lots of practice makes you better, but not perfect. I found an excellent practice method is shooting my precision 22LR from 50-300 yards. I shoot all year round going through several 'bricks" of ammo with the particular goal of learning how to more accurately determine wind. My 22LR behaves very similarly to my centerfire with drop and wind drift calculations, accurately determined by a ballistic calculator. If you establish an accurate velocity and BC for the 22RF, it works perfectly in a ballistic rangefinder out to 300-400 yards. The difference is "range" scale. My rimfire at 200 yards with 10mph, 3'clock, wind has the same 6.5 MOA wind drift(and .5MOA accuracy), as my 6.5x47 Lapua at 1200 yards. I routinely practice first shot hits on a golf ball the my 22 rimfire at 200 yards in "all" sorts of wind conditions..........it really helps with wind reading skills, which are transferable to LR centerfire work.</p><p>[ATTACH=full]94459[/ATTACH]</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1423545, member: 10291"] Wind drift is about the ballistic coefficient and velocity which establishes the dwell time for the wind to drift the bullet. Weight is not the determinant. Just turns out that the heavy for caliber bullets generally have higher BC’s then the lighter bullets. A 300gr bullet from a 338 Lapua and a 140gr in a 6.5 Creedmoor, both staring out at 2800 FPS with identical BC’s will have comparable wind drift characteristics. I have experienced this with my shooting out 1000+ yards in a constant speed/direction of wind. IMO, without sophisticated methods, it is virtually impossible to predict the exact effect of the wind for a given shot, particularly at the longer ranges. Lots of practice makes you better, but not perfect. I found an excellent practice method is shooting my precision 22LR from 50-300 yards. I shoot all year round going through several ‘bricks” of ammo with the particular goal of learning how to more accurately determine wind. My 22LR behaves very similarly to my centerfire with drop and wind drift calculations, accurately determined by a ballistic calculator. If you establish an accurate velocity and BC for the 22RF, it works perfectly in a ballistic rangefinder out to 300-400 yards. The difference is “range” scale. My rimfire at 200 yards with 10mph, 3’clock, wind has the same 6.5 MOA wind drift(and .5MOA accuracy), as my 6.5x47 Lapua at 1200 yards. I routinely practice first shot hits on a golf ball the my 22 rimfire at 200 yards in “all” sorts of wind conditions..........it really helps with wind reading skills, which are transferable to LR centerfire work. [ATTACH=full]94459[/ATTACH] [/QUOTE]
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How much wind does it take?
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