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The Basics, Starting Out
.22 LR ballistics
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<blockquote data-quote="abinok" data-source="post: 63000" data-attributes="member: 16"><p>Does a cross range wind cause vertical deflection?</p><p>You betcha.</p><p>This is one of those strange quirks that are is very readable in smallbore rifles (22s) even at 50 yds, but you rarely see them in centerfires unless you are shooting benchrest, or beyond 800ish yards.</p><p>This is probably the best graphic that shows this effect.</p><p> <img src="http://img.photobucket.com/albums/v726/abinok/3212fd26.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>The graphic says deflection is 10 o clock to 4 oclock, and thats a pretty good estimate. 10-4 is a 30 degree deflection. This translates to .573 inches of vertical displacement for each inch of horizontal deflection. maybe an example will make this clearer.</p><p>10mph, wind from 3 oclock</p><p>100yd wind drift=7.5 inches of horizontal drift, and 4.29 inches of vertical, in this case, up.</p><p>150yd wind drift=25.5 inches of horizontal drift, and 14.61 inches of vertical, in this case up.</p><p></p><p>30 degrees is about the most extreme vertical I have ever experenced.</p><p>I find that 10-15 degrees is usually a bit closer. </p><p>10 degrees translates to .172 inches of vertical for each inch of horizontal deflection. The above example would look like this:</p><p>10mph, wind from 3 oclock</p><p>100yd wind drift=7.5 inches of horizontal drift, and 1.29 inches of vertical, in this case, up.</p><p>150yd wind drift=25.5 inches of horizontal drift, and 4.38 inches of vertical, in this case up.</p><p></p><p>This effect seems to vary from bullet to bullet, and I havn't shot this particular bullet enough to quantify a value for this effect, with this bullet. I would speculate that this bullet will fall somewhere between the 10 degree, and 30 degree data. As you can see, it wouldn't be difficult to get quite a bit of vertical in a 10-20mph cross wind.</p><p>Most of my "LR" shooting with 22's is done with either the PMC Scoremaster (bc .165) or a hollow point bullet formed from the same on a set of custom dies, so I can't give you an exact value but the above examples should get you pointed in the right direction. They were calculated for the CCI Subsonic Hollow point bullet.</p><p>Keep in mind that 25" of wind drift at 150yds for a 22 is equal to 500yds with my preffered long range rifle, the 300WM.</p></blockquote><p></p>
[QUOTE="abinok, post: 63000, member: 16"] Does a cross range wind cause vertical deflection? You betcha. This is one of those strange quirks that are is very readable in smallbore rifles (22s) even at 50 yds, but you rarely see them in centerfires unless you are shooting benchrest, or beyond 800ish yards. This is probably the best graphic that shows this effect. [img]http://img.photobucket.com/albums/v726/abinok/3212fd26.jpg[/img] The graphic says deflection is 10 o clock to 4 oclock, and thats a pretty good estimate. 10-4 is a 30 degree deflection. This translates to .573 inches of vertical displacement for each inch of horizontal deflection. maybe an example will make this clearer. 10mph, wind from 3 oclock 100yd wind drift=7.5 inches of horizontal drift, and 4.29 inches of vertical, in this case, up. 150yd wind drift=25.5 inches of horizontal drift, and 14.61 inches of vertical, in this case up. 30 degrees is about the most extreme vertical I have ever experenced. I find that 10-15 degrees is usually a bit closer. 10 degrees translates to .172 inches of vertical for each inch of horizontal deflection. The above example would look like this: 10mph, wind from 3 oclock 100yd wind drift=7.5 inches of horizontal drift, and 1.29 inches of vertical, in this case, up. 150yd wind drift=25.5 inches of horizontal drift, and 4.38 inches of vertical, in this case up. This effect seems to vary from bullet to bullet, and I havn't shot this particular bullet enough to quantify a value for this effect, with this bullet. I would speculate that this bullet will fall somewhere between the 10 degree, and 30 degree data. As you can see, it wouldn't be difficult to get quite a bit of vertical in a 10-20mph cross wind. Most of my "LR" shooting with 22's is done with either the PMC Scoremaster (bc .165) or a hollow point bullet formed from the same on a set of custom dies, so I can't give you an exact value but the above examples should get you pointed in the right direction. They were calculated for the CCI Subsonic Hollow point bullet. Keep in mind that 25" of wind drift at 150yds for a 22 is equal to 500yds with my preffered long range rifle, the 300WM. [/QUOTE]
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