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Rifles, Reloading, Optics, Equipment
Reloading
Ladder or OCW... what will tell me more?
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<blockquote data-quote="Mikecr" data-source="post: 1757750" data-attributes="member: 1521"><p>We often refer to tuning like it all leads to the same 'nodes'.</p><p>But truly, it's too complicated to sum this way.</p><p></p><p>Optimum Charge Weight is dealing with powder tuning. This being where powder burn is consistent to results measured as muzzle velocities(low SD/ES).</p><p>While tolerant to variable field conditions, it's possible for the results to mean nothing directly good nor directly bad for best accuracy.</p><p></p><p>Creighton Audette Ladder testing is dealing with barrel deflections, as well as muzzle velocities through incremental charges.</p><p>That's two changes at once, with burn timing affecting both in abstract correlations.</p><p></p><p>Optimum Barrel Time is dealing with calculated barrel vibration cycles, as they affect bore/groove diameters at the muzzle.</p><p>This is not tuning, but merely clearing of an undesirable timing condition (a vibration cycle at the muzzle -during bullet release).</p><p>I feel like OBT is a misnomer in that it really defines Bad Barrel Times (BBT).</p><p></p><p>Incremental Load development amounts to other miscellaneous methods people have come up with. This is usually 2-5 shot group shooting with increasing steps of powder charge.</p><p></p><p>Cold Bore Load Development is an Incremental form with a focus on pure accuracy at worst range and shot rate.</p><p></p><p>Full Seating Testing seems relatively new, and most reloaders have never done it (including many who think they have).</p><p>I'll leave out my hypothesis for what seating is actually doing, but suggest that it's mostly independent of other adjustments.</p><p></p><p>Primer striking, or swapping, establishes a quality of powder ignition.</p><p></p><p>Rests, gun balance, and hold establish a quality of recoil and vibration during bullet travel in the barrel.</p><p></p><p>Add-on barrel tuners affect barrel deflection (Ladder results), and have no effect to OCW.</p><p></p><p>With all this you might picture a peak accuracy load that is nowhere near OCW. Or a load that is OCW, but puts bullet release at a poor timing.</p><p>You could have peak accuracy that is fleeting. You can have fantastic hot bore grouping that is horribly inaccurate in the field.</p><p>If forced to swap primers, a load could go better or worse in different categories of quality.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1757750, member: 1521"] We often refer to tuning like it all leads to the same ‘nodes’. But truly, it’s too complicated to sum this way. Optimum Charge Weight is dealing with powder tuning. This being where powder burn is consistent to results measured as muzzle velocities(low SD/ES). While tolerant to variable field conditions, it’s possible for the results to mean nothing directly good nor directly bad for best accuracy. Creighton Audette Ladder testing is dealing with barrel deflections, as well as muzzle velocities through incremental charges. That’s two changes at once, with burn timing affecting both in abstract correlations. Optimum Barrel Time is dealing with calculated barrel vibration cycles, as they affect bore/groove diameters at the muzzle. This is not tuning, but merely clearing of an undesirable timing condition (a vibration cycle at the muzzle -during bullet release). I feel like OBT is a misnomer in that it really defines Bad Barrel Times (BBT). Incremental Load development amounts to other miscellaneous methods people have come up with. This is usually 2-5 shot group shooting with increasing steps of powder charge. Cold Bore Load Development is an Incremental form with a focus on pure accuracy at worst range and shot rate. Full Seating Testing seems relatively new, and most reloaders have never done it (including many who think they have). I’ll leave out my hypothesis for what seating is actually doing, but suggest that it’s mostly independent of other adjustments. Primer striking, or swapping, establishes a quality of powder ignition. Rests, gun balance, and hold establish a quality of recoil and vibration during bullet travel in the barrel. Add-on barrel tuners affect barrel deflection (Ladder results), and have no effect to OCW. With all this you might picture a peak accuracy load that is nowhere near OCW. Or a load that is OCW, but puts bullet release at a poor timing. You could have peak accuracy that is fleeting. You can have fantastic hot bore grouping that is horribly inaccurate in the field. If forced to swap primers, a load could go better or worse in different categories of quality. [/QUOTE]
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Ladder or OCW... what will tell me more?
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