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Hunting
Long Range Hunting & Shooting
spin drift & Coriolis effect
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<blockquote data-quote="RDM416" data-source="post: 488197" data-attributes="member: 3745"><p>Rem, </p><p></p><p>Tresmon is exactly right, all those errors ADD up! To simply say you cannot shoot better that that is to miss the point..... and the target, (pun intended)<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>At 1000 yards the the spin drift on my favorite .338 load is around 5". I can reliably shoot 5" groups at 1000 sometimes better. I certainly don't want those groups to be 5" to the right at 1000 yards anymore than I would want them to be 5" to the right at 100 yards. </p><p></p><p>I don't want to start any arguments here, so I will say this is my OPINION..... If you are going to be shooting at game animals your rifle should be able to shoot a group less than the kill zone diameter of the the animal you are shooting at. For example: Lets say a whitetail has a kill zone of 10" dia. If your rifle is capable of shooting only 1 moa, that is the same as the entire kill zone..... no margin for error. In my opinion a 1 moa rifle should be used to only 700 or 800 yards. In my "opinion" a rifle used on game animals at 1000 yards should be capable of shooting 1/2 to 1/4 moa. This allows for some SMALL amount of error in aiming, spin drift, coriolis, velocity, temperature, humidity, elevation, angle, and of course that pesky wind. </p><p></p><p>Unlike wind, spin drift is a very predictable value so why not go ahead and compensate for it? Coriolis effect is a little more difficult to compensate for since it does change depending on the direction of your shot. However, the proliferation of "smart phone" based ballistic programs make this easier than ever since the phones have a gps in them. </p><p></p><p>Tresmon, Will you be having any additional classes later this spring/summer? I am only about 6 hours from you in AR and my wife has family in Nashville. I would love to attend your class this time, but I have training to go to for 4-H shooting sports. Keep us updated if you have any more classes.</p></blockquote><p></p>
[QUOTE="RDM416, post: 488197, member: 3745"] Rem, Tresmon is exactly right, all those errors ADD up! To simply say you cannot shoot better that that is to miss the point..... and the target, (pun intended):D At 1000 yards the the spin drift on my favorite .338 load is around 5". I can reliably shoot 5" groups at 1000 sometimes better. I certainly don't want those groups to be 5" to the right at 1000 yards anymore than I would want them to be 5" to the right at 100 yards. I don't want to start any arguments here, so I will say this is my OPINION..... If you are going to be shooting at game animals your rifle should be able to shoot a group less than the kill zone diameter of the the animal you are shooting at. For example: Lets say a whitetail has a kill zone of 10" dia. If your rifle is capable of shooting only 1 moa, that is the same as the entire kill zone..... no margin for error. In my opinion a 1 moa rifle should be used to only 700 or 800 yards. In my "opinion" a rifle used on game animals at 1000 yards should be capable of shooting 1/2 to 1/4 moa. This allows for some SMALL amount of error in aiming, spin drift, coriolis, velocity, temperature, humidity, elevation, angle, and of course that pesky wind. Unlike wind, spin drift is a very predictable value so why not go ahead and compensate for it? Coriolis effect is a little more difficult to compensate for since it does change depending on the direction of your shot. However, the proliferation of "smart phone" based ballistic programs make this easier than ever since the phones have a gps in them. Tresmon, Will you be having any additional classes later this spring/summer? I am only about 6 hours from you in AR and my wife has family in Nashville. I would love to attend your class this time, but I have training to go to for 4-H shooting sports. Keep us updated if you have any more classes. [/QUOTE]
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