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Long Range Hunting & Shooting
Let's all stop doing it wrong! (Wind Call Verbage)
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<blockquote data-quote="SBruce" data-source="post: 489104" data-attributes="member: 21068"><p>Yes, the ballistic software is a great place to learn the mathmatics side of LR shooting. When I was trying to figure it all out, we didn't have the ballistic programs. I had to read the Sierra Book and VHA articles and trial/error those long equations till I got it right. Contrary to what some believe, there is some math involved, and the longer the shot/smaller the target, the more important the numbers are. The math/ballistics science takes it from a Wild *** Guess to an Educated Guess.</p><p> </p><p>I am not saying that ballistic programs and math/trig make anyone a better shot..............IMO, practice, attention to detail, determination/discipline and understanding the wind and other elements are also some of the things that will make or break the deal. Alot of ammo downrange is key. When I was spotting for a friend last fall, I found myself going off of instinct (educated guess) rather that what the program said when it came to drifts/wind calls, because I could tell that the wind wasn't steady all the way to the target, or that we weren't measuring the full force from our sheltered position.</p><p> </p><p>My new coyote rifle is a 6 Long Dasher. It's a necked down 6.5X47 Lapua with a longer body and sharper 40 degree shoulder. It's about a 5% increase in capacity over the 6.5X47 Lapua case, but it's 6mm. The 20" at 600 yds is based on the 105 A-Max going 3110'/sec. I've gotten 3300'/sec with same bullet, but that was a little warm for my liking. It was still 1.5 grns under absolute maximum, but warm nonetheless. Even at 3100'/sec, this cartidge is doing the same thing that David Tubbs 6XC is doing (according to his load data on it). He shoots that round in 1000 yd competition.</p><p> </p><p>My old favorite was a 220 Swift and then more recently a 22-250. Both of these are blown off at least twice the amount that the 6LD is (with normal bullets weights). We didn't have the ultra heavy high bc 22's either when I did alot of my prarie dog shooting. Wind drift made me a very humble fellow in those days.</p><p> </p><p>The example I gave would apply at a much closer range with the 22-250. To put that same example in perspective, the big 338 Edge with a 300 SMK at 2800'/sec. supposedly has 20" of drift at 725 yds. In my experience with same load, it didn't drift quite as much as the program said, but that was limited experience, and we weren't figuring any Spin Drift or Coriolis effects in. </p><p> </p><p>Anyway, no matter what the cartridge is, at some point the details (or lack of) will start to add up and cause a miss. Not even to mention the fact that as we get further out, the bullets POI will just naturally be further from our POA to begin with. Not taking into account all the variables possible and not taking the time to do the math correctly just adds injury to insult.</p><p> </p><p>Tres is just trying to show that using .5 instead of .7 will result in a miss. All other factors being equal, that is the absolute truth. If we're going to "shortcut" it, then using 3/4 is certainly closer than using 1/2.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="SBruce, post: 489104, member: 21068"] Yes, the ballistic software is a great place to learn the mathmatics side of LR shooting. When I was trying to figure it all out, we didn't have the ballistic programs. I had to read the Sierra Book and VHA articles and trial/error those long equations till I got it right. Contrary to what some believe, there is some math involved, and the longer the shot/smaller the target, the more important the numbers are. The math/ballistics science takes it from a Wild *** Guess to an Educated Guess. I am not saying that ballistic programs and math/trig make anyone a better shot..............IMO, practice, attention to detail, determination/discipline and understanding the wind and other elements are also some of the things that will make or break the deal. Alot of ammo downrange is key. When I was spotting for a friend last fall, I found myself going off of instinct (educated guess) rather that what the program said when it came to drifts/wind calls, because I could tell that the wind wasn't steady all the way to the target, or that we weren't measuring the full force from our sheltered position. My new coyote rifle is a 6 Long Dasher. It's a necked down 6.5X47 Lapua with a longer body and sharper 40 degree shoulder. It's about a 5% increase in capacity over the 6.5X47 Lapua case, but it's 6mm. The 20" at 600 yds is based on the 105 A-Max going 3110'/sec. I've gotten 3300'/sec with same bullet, but that was a little warm for my liking. It was still 1.5 grns under absolute maximum, but warm nonetheless. Even at 3100'/sec, this cartidge is doing the same thing that David Tubbs 6XC is doing (according to his load data on it). He shoots that round in 1000 yd competition. My old favorite was a 220 Swift and then more recently a 22-250. Both of these are blown off at least twice the amount that the 6LD is (with normal bullets weights). We didn't have the ultra heavy high bc 22's either when I did alot of my prarie dog shooting. Wind drift made me a very humble fellow in those days. The example I gave would apply at a much closer range with the 22-250. To put that same example in perspective, the big 338 Edge with a 300 SMK at 2800'/sec. supposedly has 20" of drift at 725 yds. In my experience with same load, it didn't drift quite as much as the program said, but that was limited experience, and we weren't figuring any Spin Drift or Coriolis effects in. Anyway, no matter what the cartridge is, at some point the details (or lack of) will start to add up and cause a miss. Not even to mention the fact that as we get further out, the bullets POI will just naturally be further from our POA to begin with. Not taking into account all the variables possible and not taking the time to do the math correctly just adds injury to insult. Tres is just trying to show that using .5 instead of .7 will result in a miss. All other factors being equal, that is the absolute truth. If we're going to "shortcut" it, then using 3/4 is certainly closer than using 1/2.:) [/QUOTE]
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