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Rifles, Reloading, Optics, Equipment
Reloading
Finding "sweet spot" with bullet seating adjustment
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<blockquote data-quote="MNbogboy" data-source="post: 1687411" data-attributes="member: 18849"><p>I've done this both ways and it appears both methods work and one is no better than the other. End result is what matters. </p><p>Every barrel is different including the harmonics set up by its composition & physical atttibutes. </p><p>Having always respected mikecr's opinion there is disagreement on barrel harmonics concerning seating depth.</p><p> I believe contact with the lands is one of the first energies which set barrel "whip" in motion. Stretching in the chamber is happening simultaneously as pressure rises. Violent engraving as bullet accelerates from zero to thousands of feet per second seems to cancel out entry condition into the lands. Some top benchrest shooters have stated how concentricity of loaded rounds has little or no effect on group size. Seating "grip" at ignition sets up a pressure rise that eventually allows release of the bullet from case. The higher the pressure behind it the faster it will accelerate into the rifling. Momentum is the key to how hard this contact is made. Extremely low neck tensions allow for quicker bullet release and bullets contact at far less velocity. The farther from the lands the higher the velocity at contact. On the other hand a tightly crimped bullet will most likely be released with a higher pressure and obviously meet the lands going faster.</p><p>My theory, again without proof, is that seating is the biggest contribution to the setup & initiation of barrel harmonics.</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1687411, member: 18849"] I've done this both ways and it appears both methods work and one is no better than the other. End result is what matters. Every barrel is different including the harmonics set up by its composition & physical atttibutes. Having always respected mikecr's opinion there is disagreement on barrel harmonics concerning seating depth. I believe contact with the lands is one of the first energies which set barrel "whip" in motion. Stretching in the chamber is happening simultaneously as pressure rises. Violent engraving as bullet accelerates from zero to thousands of feet per second seems to cancel out entry condition into the lands. Some top benchrest shooters have stated how concentricity of loaded rounds has little or no effect on group size. Seating "grip" at ignition sets up a pressure rise that eventually allows release of the bullet from case. The higher the pressure behind it the faster it will accelerate into the rifling. Momentum is the key to how hard this contact is made. Extremely low neck tensions allow for quicker bullet release and bullets contact at far less velocity. The farther from the lands the higher the velocity at contact. On the other hand a tightly crimped bullet will most likely be released with a higher pressure and obviously meet the lands going faster. My theory, again without proof, is that seating is the biggest contribution to the setup & initiation of barrel harmonics. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Finding "sweet spot" with bullet seating adjustment
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