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Rifles, Reloading, Optics, Equipment
Reloading
Case and Loaded Round Runout question
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<blockquote data-quote="Bart B" data-source="post: 110117" data-attributes="member: 5302"><p>Different case/cartridge lengths will have different amounts of runout for the same angle of neck/bullet axis relative to the body axis. A 6mm PPC will have about the same angles when measured near the bullet tip with a .001-inch runout as a .300 Win. Mag. having .002-inch runout measured the same place. Neck runouts measured at the case mouth will have numbers about half that measured at the bullet tip when the case shoulder-body junction is the reference. Which means shorter cartridges need smaller runout numbers than longer ones.</p><p></p><p>It's been my experience that .300 Win. Mag. size cartridges will shoot very accurate with no more than .003-inch bullet tip runout providing bullets are seated to touch the lands. If the bullets jump a bit into the lands, .002-inch bullet tip runout is about max.</p><p></p><p>If you mark sized case necks' runout high point then seat bullets in them, the bullets' high point will align at or near the neck's high point. Which means you gotta have pretty straight sized case necks if you want straight seated bullets.</p></blockquote><p></p>
[QUOTE="Bart B, post: 110117, member: 5302"] Different case/cartridge lengths will have different amounts of runout for the same angle of neck/bullet axis relative to the body axis. A 6mm PPC will have about the same angles when measured near the bullet tip with a .001-inch runout as a .300 Win. Mag. having .002-inch runout measured the same place. Neck runouts measured at the case mouth will have numbers about half that measured at the bullet tip when the case shoulder-body junction is the reference. Which means shorter cartridges need smaller runout numbers than longer ones. It's been my experience that .300 Win. Mag. size cartridges will shoot very accurate with no more than .003-inch bullet tip runout providing bullets are seated to touch the lands. If the bullets jump a bit into the lands, .002-inch bullet tip runout is about max. If you mark sized case necks' runout high point then seat bullets in them, the bullets' high point will align at or near the neck's high point. Which means you gotta have pretty straight sized case necks if you want straight seated bullets. [/QUOTE]
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Case and Loaded Round Runout question
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