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The Basics, Starting Out
Ladder testing
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<blockquote data-quote="Highdesertmike" data-source="post: 1563930" data-attributes="member: 59540"><p>Jebel:</p><p>I believe that if your loading techniques don't produce consistent velocities, your never going to get any kind of respectable group. So paying attention to the details should get you loads with low ES / SD 's. </p><p>However, you can have a load with a very low ES / SD, and it won't shoot or group. This is where first tuning the velocity to find the node of the barrel comes into play. If you can picture the muzzle of your barrel vibrating in an epicyclic pattern (a circle that rolls around the inside or outside of another circle) , if not timed correctly, the bullet may leave the muzzle on one shot when the barrel is at 11 o'clock, the next shot, it is at 3 o'clock, the next it is at 8 o'clock. This will result in a wide grouping down range. But if the velocity is timed so that the bullet exits when that vibration is at it's minimum, the group will be tighter. </p><p>Finding this in your barrel is what is referred to as a "Node" Each barrel may have two or three, each presenting themselves at different velocities.</p><p>Hope this answers your question.</p></blockquote><p></p>
[QUOTE="Highdesertmike, post: 1563930, member: 59540"] Jebel: I believe that if your loading techniques don't produce consistent velocities, your never going to get any kind of respectable group. So paying attention to the details should get you loads with low ES / SD 's. However, you can have a load with a very low ES / SD, and it won't shoot or group. This is where first tuning the velocity to find the node of the barrel comes into play. If you can picture the muzzle of your barrel vibrating in an epicyclic pattern (a circle that rolls around the inside or outside of another circle) , if not timed correctly, the bullet may leave the muzzle on one shot when the barrel is at 11 o'clock, the next shot, it is at 3 o'clock, the next it is at 8 o'clock. This will result in a wide grouping down range. But if the velocity is timed so that the bullet exits when that vibration is at it's minimum, the group will be tighter. Finding this in your barrel is what is referred to as a "Node" Each barrel may have two or three, each presenting themselves at different velocities. Hope this answers your question. [/QUOTE]
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