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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
I need a refresher on load development.
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<blockquote data-quote="Guest" data-source="post: 24966"><p>The 'ladder method' is an interesting academic exercise, but very consuming of time and resources. To get to a load that works, it is much easier and quicker to fire several rounds to determine where max pressure is with a particular lot of powder.</p><p> </p><p>Once you know (for example) that 102 grains is max for that bullet and powder, back off about 2.5 percent, and then work a short ladder in about 3/10 grain increments. If the gun bullet powder combo won't hole up in the top 2 percent, switch powders, or switch bullets.</p><p> </p><p>The principles behind the ladder system do exist, but what most don't tell you is that the ladder is not made of equally spaced rungs. Almost all rifles shoot better when loaded near max pressure, The standard deviations in velocity will be smaller, and the ignition is more consistent. Also the faster a bullet is moving, the larger the standard deviation it can have, before barrel harmonics manipulate the vertical stringing the same amount as a slower load, as the barrel frequency and amplitude will not increase at the same rate as bullet velocity.</p></blockquote><p></p>
[QUOTE="Guest, post: 24966"] The 'ladder method' is an interesting academic exercise, but very consuming of time and resources. To get to a load that works, it is much easier and quicker to fire several rounds to determine where max pressure is with a particular lot of powder. Once you know (for example) that 102 grains is max for that bullet and powder, back off about 2.5 percent, and then work a short ladder in about 3/10 grain increments. If the gun bullet powder combo won't hole up in the top 2 percent, switch powders, or switch bullets. The principles behind the ladder system do exist, but what most don't tell you is that the ladder is not made of equally spaced rungs. Almost all rifles shoot better when loaded near max pressure, The standard deviations in velocity will be smaller, and the ignition is more consistent. Also the faster a bullet is moving, the larger the standard deviation it can have, before barrel harmonics manipulate the vertical stringing the same amount as a slower load, as the barrel frequency and amplitude will not increase at the same rate as bullet velocity. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
I need a refresher on load development.
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