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spin drift
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<blockquote data-quote="Michael Eichele" data-source="post: 249885" data-attributes="member: 1007"><p>In average conditions most here do not have the abilities to separate wind drift from SD. Myself included. However, I am lucky enough to live in an area where there is little to do in the winter except shoot. What does this have to do with SD? Well on really cold winter mornings, wind is often nill, zip, zilch ZERO!</p><p></p><p>This is how I have been able to do my own testing and research. I have been able to measure it by eliminating wind as a factor. </p><p></p><p>Yes I factor it into any 800+ yard shot. Wind or no wind.</p><p></p><p>Most shooters might feel the wind and compensate and shoot. Experiance has taught them to compensate in a way that works. They get the results they get through experiance regardless of their knowledge or lack thereof or compensation, or lack thereof of SD.</p><p></p><p>The bottom line is that if you have a system that works, with or without compensating for SD, dont worry about it. Shoot your system and be happy.</p><p></p><p>If you never have the ability to shoot in a windless day, you will learn how to hit with your rifle in windy conditions. When youre learning and experimenting, you may feel like you always hit just a bit farther to the right than you like. This sets up your subconscience to estimate differently. You begin to judge with your instincs (through experiance) and start to hit, never knowing "other" forces are out there.</p><p></p><p>My system relys on me first establishing how much windage I need for actual wind. Then I either add or subtract my personal SD. For my 300 RUM its about 8" for SD and coriolus. For my 308 winnie its about 11" SD and coriouls. Whether the wind seems concistent throught the coarse of the shot or inconcistent, I still estimate how much to compensate for. I will come up with a rough number for MPH taking into account the direction. If time permits, I will plug these numbers into the ballistic program (mine predicts SD) it either adds or subtracts what is needed for SD. My software uses a clock 12 Oclock all the way through to 11Oclock. It knows I am using a right hand twist and what my stability factor and time of flight is, puts all the numbers in and give me an answer. Yes there are times that wind is more tricky than that. An example is this fall I was with my cousin hunting moose. The shot was 600 yards. BTW I dont factor SD at 600 due to its smallish effects at that range. I could see cotton wood fluff in the air in the wind and thermals very erradic at different ranges. at 200 yards it was one way, at 400 it was another. In our face it was dead on. At the bull I have no idea. I called for him to shoot with 0 wind even though it was a solid 10+ MPH. Guess what? He hammered the bull in the shoulders. Sometimes you just have to use your instincts to guess the wind and add or subtract any SD should it have been a longer shot.</p><p></p><p>Also anybody who relys on a 6" SD figure is fooling themselves. It can be a bit less or it can be a bit more. It will depend on many factors. This is why the software I use uses stabilty factors and time of flight. Because it is very dependant on twist, velocity, bullet demensions, and atmoshperic conditions as well.</p><p></p><p>Bottome line is if youre shooting with a system that is working for you. Dont change it.</p><p></p><p>Some guys myself included are just really anal for lack of a better term. I just want to know ALL of the variables and decide when the time comes to factor it in or not for a given set of circumstances. I am more mathematical when setting up for a LR shot. Others are more instictuall. Is there a right or wrong? If youre hitting and I am hitting, then no. It is what is working for who at a given time in there LR endevors.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 249885, member: 1007"] In average conditions most here do not have the abilities to separate wind drift from SD. Myself included. However, I am lucky enough to live in an area where there is little to do in the winter except shoot. What does this have to do with SD? Well on really cold winter mornings, wind is often nill, zip, zilch ZERO! This is how I have been able to do my own testing and research. I have been able to measure it by eliminating wind as a factor. Yes I factor it into any 800+ yard shot. Wind or no wind. Most shooters might feel the wind and compensate and shoot. Experiance has taught them to compensate in a way that works. They get the results they get through experiance regardless of their knowledge or lack thereof or compensation, or lack thereof of SD. The bottom line is that if you have a system that works, with or without compensating for SD, dont worry about it. Shoot your system and be happy. If you never have the ability to shoot in a windless day, you will learn how to hit with your rifle in windy conditions. When youre learning and experimenting, you may feel like you always hit just a bit farther to the right than you like. This sets up your subconscience to estimate differently. You begin to judge with your instincs (through experiance) and start to hit, never knowing "other" forces are out there. My system relys on me first establishing how much windage I need for actual wind. Then I either add or subtract my personal SD. For my 300 RUM its about 8" for SD and coriolus. For my 308 winnie its about 11" SD and coriouls. Whether the wind seems concistent throught the coarse of the shot or inconcistent, I still estimate how much to compensate for. I will come up with a rough number for MPH taking into account the direction. If time permits, I will plug these numbers into the ballistic program (mine predicts SD) it either adds or subtracts what is needed for SD. My software uses a clock 12 Oclock all the way through to 11Oclock. It knows I am using a right hand twist and what my stability factor and time of flight is, puts all the numbers in and give me an answer. Yes there are times that wind is more tricky than that. An example is this fall I was with my cousin hunting moose. The shot was 600 yards. BTW I dont factor SD at 600 due to its smallish effects at that range. I could see cotton wood fluff in the air in the wind and thermals very erradic at different ranges. at 200 yards it was one way, at 400 it was another. In our face it was dead on. At the bull I have no idea. I called for him to shoot with 0 wind even though it was a solid 10+ MPH. Guess what? He hammered the bull in the shoulders. Sometimes you just have to use your instincts to guess the wind and add or subtract any SD should it have been a longer shot. Also anybody who relys on a 6" SD figure is fooling themselves. It can be a bit less or it can be a bit more. It will depend on many factors. This is why the software I use uses stabilty factors and time of flight. Because it is very dependant on twist, velocity, bullet demensions, and atmoshperic conditions as well. Bottome line is if youre shooting with a system that is working for you. Dont change it. Some guys myself included are just really anal for lack of a better term. I just want to know ALL of the variables and decide when the time comes to factor it in or not for a given set of circumstances. I am more mathematical when setting up for a LR shot. Others are more instictuall. Is there a right or wrong? If youre hitting and I am hitting, then no. It is what is working for who at a given time in there LR endevors. [/QUOTE]
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