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Long Range Hunting & Shooting
***1000 YARD COLD BORE SHOT (This Saturday)****
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<blockquote data-quote="RDM416" data-source="post: 685226" data-attributes="member: 3745"><p>Jason,</p><p></p><p>In Bullet Flight you need to go to the menu page and select "modify", then select "edit" this will bring up a page that will allow you to input barrel twist. From that same page select "edit" (just below "ammo profile"). That will bring up a page that will allow you to populate bullet length. Back to the menu page and select "options" that will bring up the check box(s) for spin drift and coriolis. </p><p></p><p></p><p></p><p>No problem discussing discussing spin or coriolis. Here is where I will get into trouble with some...... For explanation purposes I will start with spin drift. When I do not add spin drift into my solution I begin to see my shots start to fall a little right beginning at 500 yards, increasing to 5 to 6 inches at 1000 yards. This is real world testing done many times with several rifles. If I don't account for spin drift I see it, real world in my group placement. </p><p></p><p>Not so with coriolis. Keep in mind I am only talking at 1000 yards and under here. Without a coriolis correction on a calm wind day I have no problem keeping my shots centered on my 1000 yard gong. Unlike spin drift where I see the problem with my groups impacting right. Since I don't see it, I don't dial for it........... </p><p></p><p>Now, before before the coriolis gurus all jump on me here........ I am not saying it does not exist. I am an engineer with a fair amount of physics in my background, so I certainly understand the concept and the calculations behind it. All I am saying is in my "experience" at ranges of 1000 yards and under, I simply do not see it. As I extend my effective range on out to 1500 and beyond I will continue to play with it. It could very well be that my shooting and wind reading skills are not good enough for me to be able to see the more subtle deviations from coriolis. I expect it will begin to show up more at longer ranges. Like I said in my original comment on this subject, "this is what I do". There are others on this site who are far more experienced and knowledgeable than I. I am certainly willing to listen and learn.</p><p></p><p>Kirby, If you are still watching this thread, Tubb has discontinued producing the bearing surface comparator.</p></blockquote><p></p>
[QUOTE="RDM416, post: 685226, member: 3745"] Jason, In Bullet Flight you need to go to the menu page and select "modify", then select "edit" this will bring up a page that will allow you to input barrel twist. From that same page select "edit" (just below "ammo profile"). That will bring up a page that will allow you to populate bullet length. Back to the menu page and select "options" that will bring up the check box(s) for spin drift and coriolis. No problem discussing discussing spin or coriolis. Here is where I will get into trouble with some...... For explanation purposes I will start with spin drift. When I do not add spin drift into my solution I begin to see my shots start to fall a little right beginning at 500 yards, increasing to 5 to 6 inches at 1000 yards. This is real world testing done many times with several rifles. If I don't account for spin drift I see it, real world in my group placement. Not so with coriolis. Keep in mind I am only talking at 1000 yards and under here. Without a coriolis correction on a calm wind day I have no problem keeping my shots centered on my 1000 yard gong. Unlike spin drift where I see the problem with my groups impacting right. Since I don't see it, I don't dial for it........... Now, before before the coriolis gurus all jump on me here........ I am not saying it does not exist. I am an engineer with a fair amount of physics in my background, so I certainly understand the concept and the calculations behind it. All I am saying is in my "experience" at ranges of 1000 yards and under, I simply do not see it. As I extend my effective range on out to 1500 and beyond I will continue to play with it. It could very well be that my shooting and wind reading skills are not good enough for me to be able to see the more subtle deviations from coriolis. I expect it will begin to show up more at longer ranges. Like I said in my original comment on this subject, "this is what I do". There are others on this site who are far more experienced and knowledgeable than I. I am certainly willing to listen and learn. Kirby, If you are still watching this thread, Tubb has discontinued producing the bearing surface comparator. [/QUOTE]
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