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Rifles, Reloading, Optics, Equipment
Reloading
Ladder testing at 1k- Detailed article and video
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<blockquote data-quote="Bart B" data-source="post: 356570" data-attributes="member: 5302"><p>Some folks who shoot accurately at the longer ranges have known for years that some extruded powders have a narrow charge weight range at some value for many cartridges that produces best accuracy all the way out to the longest ranges. Ball powders have never quite done as well.</p><p></p><p>But nobody's ever proved that ladder testing determines the charge weight producing best long range accuracy makes the bullet exit the barrel at any given point in its whip cycle. To do that, one needs two accelerometers on the barrel (one at the muzzle and one at the barrel's zero movement node back a ways from the muzzle) connected to equipment to display where the muzzle's bore axis is when the bullet exits. A sensor will also be needed at the muzzle to detect when the bullet clears it also has to be feed to that equipment. Then one can see where in the vertical whip cycle and angle the bullet leaves at.</p><p></p><p>A given barreled action with a scope has one fundamental frequency it whips at with the largest angular movement at the muzzle's bore axis and it never changes regardless of the load shot in it. That frequency is typically less than 100 cycles per second; one cycle in 1/100th or .010 second.</p><p></p><p>High powered rifle bullets are gone before the barrel's went through 1/6th of a cycle. It's best for accuracy if all bullets leave on the muzzle axis up swing so faster ones depart at a slightly lower angle than slower ones.</p><p></p><p>Don't think a barreled action's high frequency sound one hears when they smack it with a hammer is what it whips at. That's caused by pressure waves bouncing back and forth between the ends at about 18,000 fps through the steel. That'll be a couple thousand cycles per second and any muzzle axis direction changes at that frequency are insignificant.</p></blockquote><p></p>
[QUOTE="Bart B, post: 356570, member: 5302"] Some folks who shoot accurately at the longer ranges have known for years that some extruded powders have a narrow charge weight range at some value for many cartridges that produces best accuracy all the way out to the longest ranges. Ball powders have never quite done as well. But nobody's ever proved that ladder testing determines the charge weight producing best long range accuracy makes the bullet exit the barrel at any given point in its whip cycle. To do that, one needs two accelerometers on the barrel (one at the muzzle and one at the barrel's zero movement node back a ways from the muzzle) connected to equipment to display where the muzzle's bore axis is when the bullet exits. A sensor will also be needed at the muzzle to detect when the bullet clears it also has to be feed to that equipment. Then one can see where in the vertical whip cycle and angle the bullet leaves at. A given barreled action with a scope has one fundamental frequency it whips at with the largest angular movement at the muzzle's bore axis and it never changes regardless of the load shot in it. That frequency is typically less than 100 cycles per second; one cycle in 1/100th or .010 second. High powered rifle bullets are gone before the barrel's went through 1/6th of a cycle. It's best for accuracy if all bullets leave on the muzzle axis up swing so faster ones depart at a slightly lower angle than slower ones. Don't think a barreled action's high frequency sound one hears when they smack it with a hammer is what it whips at. That's caused by pressure waves bouncing back and forth between the ends at about 18,000 fps through the steel. That'll be a couple thousand cycles per second and any muzzle axis direction changes at that frequency are insignificant. [/QUOTE]
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Ladder testing at 1k- Detailed article and video
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