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Rifles, Reloading, Optics, Equipment
Reloading
Lee and RCBS powder scale inaccuracy...
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<blockquote data-quote="Bart B" data-source="post: 794127" data-attributes="member: 5302"><p>There's also the situation when some powders with a 3/10ths spread in charge weight, 5% spread in peak pressure and 40 fps spread in muzzle velocity producing better accuracy than other powders with less than 1/10th grain charge weight spread, 3% spread in peak pressure and less than 20 fps spread in muzzle velocity.</p><p></p><p>Benchresters have been measuring powder charges by volume instead of weight for matches up to 300 yards for decades. They use powders having small muzzle velocity changes for a 1/10th grain change in charge weight. Such powders typically produce best accuracy as their pressure curves are more repeatable in size and shape. Military arsenal match ammo's charges have been measured by volume, too, and typically produce better accuracy than many folks making their own ammo with exact charge weights.</p><p></p><p>There's other things about cartridge components that cause more accuracy problems than a 1/10th grain change in powder does. Charge weight's way down the list of important things to have and do.</p></blockquote><p></p>
[QUOTE="Bart B, post: 794127, member: 5302"] There's also the situation when some powders with a 3/10ths spread in charge weight, 5% spread in peak pressure and 40 fps spread in muzzle velocity producing better accuracy than other powders with less than 1/10th grain charge weight spread, 3% spread in peak pressure and less than 20 fps spread in muzzle velocity. Benchresters have been measuring powder charges by volume instead of weight for matches up to 300 yards for decades. They use powders having small muzzle velocity changes for a 1/10th grain change in charge weight. Such powders typically produce best accuracy as their pressure curves are more repeatable in size and shape. Military arsenal match ammo's charges have been measured by volume, too, and typically produce better accuracy than many folks making their own ammo with exact charge weights. There's other things about cartridge components that cause more accuracy problems than a 1/10th grain change in powder does. Charge weight's way down the list of important things to have and do. [/QUOTE]
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Lee and RCBS powder scale inaccuracy...
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