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Rifles, Reloading, Optics, Equipment
Reloading
Finding "sweet spot" with bullet seating adjustment
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<blockquote data-quote="Mikecr" data-source="post: 1686673" data-attributes="member: 1521"><p>Seating as a harmonic adjustment (a tune) doesn't pass tests, and truths pass all tests.</p><p>You can easily counter a MV change from seating with powder, and it makes no difference to where best seating is. In fact you can find best seating with any load, whether grouping is large or small.</p><p>Also, with best seating determined to be off the lands (OTL), you don't ever have to chase the lands, with no load changes, for the accurate life of that barrel.</p><p>Chasing lands is merely synonymous with chasing your tail..</p><p></p><p>I couldn't declare law on it, but there is this hypothesis that passes tests:</p><p>If you've seen a lottery drawing on TV, then your familiar with ping-pong balls rattling into a tube. If you setup a lexan throat 1thou over ball diameter fed into a tube at ball diameter, and applied pressure to force the ball forward, then with a high speed camera you could see ping-pong bullets rattling into their bore/groove.</p><p>The ball lays in it's throat between shots at X distance from bore, and firing pressure pushes the back of the ball, but some goes around it (within that 1thou clearance).</p><p>At certain X distance increments the ball's transition is smoother, more consistent.</p><p></p><p>I don't think this is significantly affecting the pressure behind bullets(unless ITL), but is affecting deformation and the fidelity of eventual muzzle release. Notice during seating testing that grouping opens all directions and abruptly collapses to better or worse.</p><p>It's not like powder tuning. You couldn't shoot a seating ladder.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1686673, member: 1521"] Seating as a harmonic adjustment (a tune) doesn't pass tests, and truths pass all tests. You can easily counter a MV change from seating with powder, and it makes no difference to where best seating is. In fact you can find best seating with any load, whether grouping is large or small. Also, with best seating determined to be off the lands (OTL), you don't ever have to chase the lands, with no load changes, for the accurate life of that barrel. Chasing lands is merely synonymous with chasing your tail.. I couldn't declare law on it, but there is this hypothesis that passes tests: If you've seen a lottery drawing on TV, then your familiar with ping-pong balls rattling into a tube. If you setup a lexan throat 1thou over ball diameter fed into a tube at ball diameter, and applied pressure to force the ball forward, then with a high speed camera you could see ping-pong bullets rattling into their bore/groove. The ball lays in it's throat between shots at X distance from bore, and firing pressure pushes the back of the ball, but some goes around it (within that 1thou clearance). At certain X distance increments the ball's transition is smoother, more consistent. I don't think this is significantly affecting the pressure behind bullets(unless ITL), but is affecting deformation and the fidelity of eventual muzzle release. Notice during seating testing that grouping opens all directions and abruptly collapses to better or worse. It's not like powder tuning. You couldn't shoot a seating ladder. [/QUOTE]
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Reloading
Finding "sweet spot" with bullet seating adjustment
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