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Rifles, Reloading, Optics, Equipment
Reloading
Ladder Test Results...need help analyzing.
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<blockquote data-quote="Bart B" data-source="post: 704660" data-attributes="member: 5302"><p>Those believing the OCW method is reality should learn that most rifle barrels whip the greatest angular amount at the muzzle around 400 to 500 cycles per second vertically. It's a harmonic of the fundamental or resonant fequency of the barrel which is a lower frequency. This is the main contributor to vertical shot stringing on target. That 18,000 fps speed of sound thing the OCW site dwells on only changes muzzle diameter a few millionths of an inch. If it was enough to see accuracy problems, then there would be no copper wash the last inch or so of the bore 'cause the bore and groove diameters would have opened up enough to be harmful. As long as that copper wash is there, bullets are well guided out the muzzle.</p><p></p><p>If the bullet not being touched by oversize diameters at the muzzle, then why do Garands rebuilt into precision match grade service rifles still shoot sub 2/3 MOA groups at 600 yards with the lands and grooves worn away from steel cleaning rods for the last inch or so of the bore back from the muzzle? All four of the Garand barrels I wore out did this.</p><p></p><p>It's best that bullets leave just before the muzzle axis is going up and reaches its highest angle so slower ones leave later and faster ones leave slower to compensate for their trajectory curves. It doesn't matter where that high frequency shock wave is. Even the best lapped precision barrels have more dimensional tolerances that what that shock wave creates.</p></blockquote><p></p>
[QUOTE="Bart B, post: 704660, member: 5302"] Those believing the OCW method is reality should learn that most rifle barrels whip the greatest angular amount at the muzzle around 400 to 500 cycles per second vertically. It's a harmonic of the fundamental or resonant fequency of the barrel which is a lower frequency. This is the main contributor to vertical shot stringing on target. That 18,000 fps speed of sound thing the OCW site dwells on only changes muzzle diameter a few millionths of an inch. If it was enough to see accuracy problems, then there would be no copper wash the last inch or so of the bore 'cause the bore and groove diameters would have opened up enough to be harmful. As long as that copper wash is there, bullets are well guided out the muzzle. If the bullet not being touched by oversize diameters at the muzzle, then why do Garands rebuilt into precision match grade service rifles still shoot sub 2/3 MOA groups at 600 yards with the lands and grooves worn away from steel cleaning rods for the last inch or so of the bore back from the muzzle? All four of the Garand barrels I wore out did this. It's best that bullets leave just before the muzzle axis is going up and reaches its highest angle so slower ones leave later and faster ones leave slower to compensate for their trajectory curves. It doesn't matter where that high frequency shock wave is. Even the best lapped precision barrels have more dimensional tolerances that what that shock wave creates. [/QUOTE]
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Ladder Test Results...need help analyzing.
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