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Long Range Hunting & Shooting
Left @ 300 yds - Right @ 1000 yds? WTH?
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<blockquote data-quote="Michael Eichele" data-source="post: 245426" data-attributes="member: 1007"><p>What you have read is correct. I think you missunderstand my statement. Your particular loads in your particular rifles shouldnt be much more than about 6".</p><p></p><p>There are ALOT of variables that go into figuring spin drift. Velocity, air density, BC, twist of barrel, ect....AND their relationship to eachother. </p><p></p><p>Please understand I was not saying that all small arms ballistics yield 6" rather it was generated by a ballistics program based on what info you did provide. I obviously dont know your twists in your barrels so it was a guess. They could be more. But not much more. Still your real world spin drift is alot less than where your bullets impacting at the time of your first post.</p><p></p><p>I have seen 10-12" of spin drift in my old test 308 at 1K depending on conditions AND the load used. This was concistent with ballistic software and other calculations. I have also seen much smaller results from other of my rifles and loads. Again concistent with calulators and calculations.</p><p></p><p>For me to say that bullets are limited to 6" @ 1K would be erroneous at best. The fact is that it will be different from load to load and barrel to barrel. Now similar barrels with similar loads will be VERY close but drastically different rifles and loads will be much different from eachother.</p><p></p><p>I hope that clears up my original comments!</p><p></p><p>PS:</p><p></p><p>One more thought.</p><p></p><p>The point of my first post wasnt to tell you exactly how much SD you are getting rather it was an estimate to illustrate that SD was not the one and only reason you were seeing such a dramatic right impact down range. If I missled you in any way I humbly apologize.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 245426, member: 1007"] What you have read is correct. I think you missunderstand my statement. Your particular loads in your particular rifles shouldnt be much more than about 6". There are ALOT of variables that go into figuring spin drift. Velocity, air density, BC, twist of barrel, ect....AND their relationship to eachother. Please understand I was not saying that all small arms ballistics yield 6" rather it was generated by a ballistics program based on what info you did provide. I obviously dont know your twists in your barrels so it was a guess. They could be more. But not much more. Still your real world spin drift is alot less than where your bullets impacting at the time of your first post. I have seen 10-12" of spin drift in my old test 308 at 1K depending on conditions AND the load used. This was concistent with ballistic software and other calculations. I have also seen much smaller results from other of my rifles and loads. Again concistent with calulators and calculations. For me to say that bullets are limited to 6" @ 1K would be erroneous at best. The fact is that it will be different from load to load and barrel to barrel. Now similar barrels with similar loads will be VERY close but drastically different rifles and loads will be much different from eachother. I hope that clears up my original comments! PS: One more thought. The point of my first post wasnt to tell you exactly how much SD you are getting rather it was an estimate to illustrate that SD was not the one and only reason you were seeing such a dramatic right impact down range. If I missled you in any way I humbly apologize. [/QUOTE]
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Left @ 300 yds - Right @ 1000 yds? WTH?
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