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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
G1... G7... ??
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<blockquote data-quote="Jeff In TX" data-source="post: 337604" data-attributes="member: 1522"><p>Mike,</p><p>We refer to that Cheshire cat grin as something else here in Texas, more like a $*it eating grin! LOL This was a great thread with lots of good and informative information. </p><p></p><p>Bryan, </p><p>I wish I had a job like yours where I could shoot and test for a living. I spent last night running and playing with numbers (the scream you hear in the back ground was my wife saying "give it rest already"!). Keeping with the G7 coefficient drag model provides the best all round solution for most types of boat tail bullet. Those that don't really fit nicely into the G7 model would still calculate better than using the G1 drag model. </p><p></p><p>I did state in my previous post that we'd be splitting hairs by using the G5 or G7 for most boat tails. By changing some of my known G5 BC's to G7 and re-running numbers didn't produce any significant changes in output data. Actually the changes were so small, they would have fallen into the human error category at distances of 700 yards or more. </p><p></p><p>So for the sake of argument and my sanity I'll fall in to the ranks and just say use the G7 coefficient drag model for boat tail bullets.</p><p></p><p>Mike and Bryan, great information and have a great holiday season...Merry Christmas everyone!</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 337604, member: 1522"] Mike, We refer to that Cheshire cat grin as something else here in Texas, more like a $*it eating grin! LOL This was a great thread with lots of good and informative information. Bryan, I wish I had a job like yours where I could shoot and test for a living. I spent last night running and playing with numbers (the scream you hear in the back ground was my wife saying “give it rest already”!). Keeping with the G7 coefficient drag model provides the best all round solution for most types of boat tail bullet. Those that don’t really fit nicely into the G7 model would still calculate better than using the G1 drag model. I did state in my previous post that we’d be splitting hairs by using the G5 or G7 for most boat tails. By changing some of my known G5 BC’s to G7 and re-running numbers didn’t produce any significant changes in output data. Actually the changes were so small, they would have fallen into the human error category at distances of 700 yards or more. So for the sake of argument and my sanity I’ll fall in to the ranks and just say use the G7 coefficient drag model for boat tail bullets. Mike and Bryan, great information and have a great holiday season...Merry Christmas everyone! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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G1... G7... ??
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