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How much wind does it take?
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<blockquote data-quote="RonS" data-source="post: 1415902" data-attributes="member: 68613"><p>The variables for wind drift are force, mass and time. The force of the wind causes deflection. Deflection is the change in angle between the muzzle and the target. At 50 yards the deflection may only be 1/4 of an inch. At a 1000 yards (assuming no further deflection in either direction, as in dead air) it will be 2.5 inches given the deviation of the bullet from its intended flight early on. The sooner the deflection occurs the more the error at the end. Simple physics, an object in motion will remain in motion unless acted upon by a force. The forces here being wind, friction and gravity. The latter two cause drop, the first causes drift. A 10 mile an hour cross wind over the course of 1000 yards will deflect a 168 grain 308 bullet traveling at 2600 fps roughly 108 inches. 25-06 at 500? The ballistics calculator says that my 243 firing 115 DTAC's in a 10 mph wind will drift 9.92 inches at 500 yards. Of course there is no such thing as a consistent wind across a course and especially shot to shot. Hence the "art" of marksmanship. It's all about wind reading skills.</p></blockquote><p></p>
[QUOTE="RonS, post: 1415902, member: 68613"] The variables for wind drift are force, mass and time. The force of the wind causes deflection. Deflection is the change in angle between the muzzle and the target. At 50 yards the deflection may only be 1/4 of an inch. At a 1000 yards (assuming no further deflection in either direction, as in dead air) it will be 2.5 inches given the deviation of the bullet from its intended flight early on. The sooner the deflection occurs the more the error at the end. Simple physics, an object in motion will remain in motion unless acted upon by a force. The forces here being wind, friction and gravity. The latter two cause drop, the first causes drift. A 10 mile an hour cross wind over the course of 1000 yards will deflect a 168 grain 308 bullet traveling at 2600 fps roughly 108 inches. 25-06 at 500? The ballistics calculator says that my 243 firing 115 DTAC's in a 10 mph wind will drift 9.92 inches at 500 yards. Of course there is no such thing as a consistent wind across a course and especially shot to shot. Hence the "art" of marksmanship. It's all about wind reading skills. [/QUOTE]
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