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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic mystery, would like your thoughts.....
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<blockquote data-quote="Jeff In TX" data-source="post: 159456" data-attributes="member: 1522"><p>I've got a couple of ideas but at 2 to 3K who really knows. Ballistics is just math and physics. Are you using a G1 drag model as your basis? If so, I don't care whose ballistic program you're using that's going to screw up your results especially at those distances. Actually I wouldn't trust a G1 drag model beyond 500 yards but that's just me. Using multiple BC's is a total waste of time and effort and doesn't accomplish a thing! That's a short coming of ballistic programs trying to message the G1 drag model for slightly more accurate results.</p><p></p><p>A good ballistic program should have CD models (coefficient drag models) such as G5 and G7 drag models. These programs are much more accurate at extreme ranges, but it all depends on what model your bullet fits into and using the proper BC for that model. You can't use the published G1 BC for those models. Your bullets BC should really be calculated to how it's performing from your gun and matched to the proper drag model. This is simple to accomplish with RSI ballistic program and a good chronograph. </p><p></p><p>If you can give me your average muzzle velocity as well as a 100 yard and even better a 200 yard velocity, I can match your bullet to the proper drag model and calculate the proper BC for your bullets, then we can re-run your numbers. We'll need a bit more info to run the numbers but we can take that off line. </p><p></p><p>So my first thought is the ballistic model and BC you're using?</p><p></p><p>My second thought could be the tracking of your scope. Does it truly track accurately through the full range of elevation? It may track differently as you increase elevation. Screwy as that sounds it happens.</p><p></p><p>Those are my thoughts. Must be nice to shoot at those ranges. Let me know if I can help.</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 159456, member: 1522"] I’ve got a couple of ideas but at 2 to 3K who really knows. Ballistics is just math and physics. Are you using a G1 drag model as your basis? If so, I don’t care whose ballistic program you’re using that’s going to screw up your results especially at those distances. Actually I wouldn’t trust a G1 drag model beyond 500 yards but that’s just me. Using multiple BC's is a total waste of time and effort and doesn't accomplish a thing! That’s a short coming of ballistic programs trying to message the G1 drag model for slightly more accurate results. A good ballistic program should have CD models (coefficient drag models) such as G5 and G7 drag models. These programs are much more accurate at extreme ranges, but it all depends on what model your bullet fits into and using the proper BC for that model. You can’t use the published G1 BC for those models. Your bullets BC should really be calculated to how it’s performing from your gun and matched to the proper drag model. This is simple to accomplish with RSI ballistic program and a good chronograph. If you can give me your average muzzle velocity as well as a 100 yard and even better a 200 yard velocity, I can match your bullet to the proper drag model and calculate the proper BC for your bullets, then we can re-run your numbers. We’ll need a bit more info to run the numbers but we can take that off line. So my first thought is the ballistic model and BC you’re using? My second thought could be the tracking of your scope. Does it truly track accurately through the full range of elevation? It may track differently as you increase elevation. Screwy as that sounds it happens. Those are my thoughts. Must be nice to shoot at those ranges. Let me know if I can help. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic mystery, would like your thoughts.....
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