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Hunting
Extreme Long Range Hunting & Shooting (ELR)
Shooting my 338 LM @ 2200 meter
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<blockquote data-quote="Shumba" data-source="post: 625642" data-attributes="member: 12337"><p>My apologies as I do not know how to do the multiple quotes</p><p> </p><p>Quote:</p><p>I estimate Yrcans temp, press. and other measuerements to be accurate within 2-3units of measurement. Wind probably far better, as we can see there is very little wind anyway.</p><p> </p><p>My impression in the video is that there is a fairly good wind. It can be heard in the Mic of the video camera, the ripples on the water and waves on the far shore dont strike me as calm conditions. I could be wrong but I have spent a lot of time on the water as a fishing guide in the past, and the water seems to have a fair wind over it. It also appears, it could be an illusion, that the spray from the bullet impact seems to go right and possibly toward the shooter upon settling after every shot, due to wind.</p><p> </p><p>Quote:</p><p>The question becomes then, does the G7 BC change with velocity, and does it change on the order of 0.02 units? </p><p>Does it change at the speed of sound? After all the bullet is travelling 600m, and for 2 seconds, below the speed of sound. If this is the case, the only solution will be a custom drag model, or to tweak it with different BCs for different ranges, or to use a bullet that fits the existing drag model.</p><p> </p><p>The bullets BC does change with velocity and it could easily change by more than .02 units at that distance. The bullets velocity is constantly getting slower and the BC is constantly changing as the velocity changes. If the bullet he is using has a BC of .780 that may be good to1000 yards, but will most likely not be a valid number for soloutions at 1800 or 2000 yards. At that distance he was shooting the bullet would be below 1000 fps and is possibly in a state of unstabilized yaw and who knows what else, further affecting the drag and velocity loss of the bullet. </p><p> </p><p>Shots like that are stretching the boundries of what the typical small arms cartridges can do with calculated predictable accuracy. Thats why Cpl Craig Harrisons 2475 meter and Rob Furlongs 2430 meter shots are so remarkable.</p></blockquote><p></p>
[QUOTE="Shumba, post: 625642, member: 12337"] My apologies as I do not know how to do the multiple quotes Quote: I estimate Yrcans temp, press. and other measuerements to be accurate within 2-3units of measurement. Wind probably far better, as we can see there is very little wind anyway. My impression in the video is that there is a fairly good wind. It can be heard in the Mic of the video camera, the ripples on the water and waves on the far shore dont strike me as calm conditions. I could be wrong but I have spent a lot of time on the water as a fishing guide in the past, and the water seems to have a fair wind over it. It also appears, it could be an illusion, that the spray from the bullet impact seems to go right and possibly toward the shooter upon settling after every shot, due to wind. Quote: The question becomes then, does the G7 BC change with velocity, and does it change on the order of 0.02 units? Does it change at the speed of sound? After all the bullet is travelling 600m, and for 2 seconds, below the speed of sound. If this is the case, the only solution will be a custom drag model, or to tweak it with different BCs for different ranges, or to use a bullet that fits the existing drag model. The bullets BC does change with velocity and it could easily change by more than .02 units at that distance. The bullets velocity is constantly getting slower and the BC is constantly changing as the velocity changes. If the bullet he is using has a BC of .780 that may be good to1000 yards, but will most likely not be a valid number for soloutions at 1800 or 2000 yards. At that distance he was shooting the bullet would be below 1000 fps and is possibly in a state of unstabilized yaw and who knows what else, further affecting the drag and velocity loss of the bullet. Shots like that are stretching the boundries of what the typical small arms cartridges can do with calculated predictable accuracy. Thats why Cpl Craig Harrisons 2475 meter and Rob Furlongs 2430 meter shots are so remarkable. [/QUOTE]
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Extreme Long Range Hunting & Shooting (ELR)
Shooting my 338 LM @ 2200 meter
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