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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth tests
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<blockquote data-quote="cajun" data-source="post: 1815941" data-attributes="member: 9772"><p>I believe seating depth relates to barrel harmonics or barrel timing if you will. This is why if you are in a large powder node you don't see a radical change in poi or velocity with seating depth changes. Think of it this way. At a given velocity the time it takes the bullet to travel down the barrel is x. If you move the bullet closer or further from the lands you change the timing of the bullets exit from the muzzle. A stable velocity node is actually a spot in the barrels vibration where it is at the top or the bottom of its travel and not moving up or down rapidly. This is why if you do a ladder test with incremental powder charges sometimes a lower charge weight will impact higher on the target. It is exiting the barrel at a higher point in the barrels travel.</p></blockquote><p></p>
[QUOTE="cajun, post: 1815941, member: 9772"] I believe seating depth relates to barrel harmonics or barrel timing if you will. This is why if you are in a large powder node you don't see a radical change in poi or velocity with seating depth changes. Think of it this way. At a given velocity the time it takes the bullet to travel down the barrel is x. If you move the bullet closer or further from the lands you change the timing of the bullets exit from the muzzle. A stable velocity node is actually a spot in the barrels vibration where it is at the top or the bottom of its travel and not moving up or down rapidly. This is why if you do a ladder test with incremental powder charges sometimes a lower charge weight will impact higher on the target. It is exiting the barrel at a higher point in the barrels travel. [/QUOTE]
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Seating depth tests
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