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Rifles, Reloading, Optics, Equipment
Reloading
bullet seating accuracy
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<blockquote data-quote="boomtube" data-source="post: 842405" data-attributes="member: 9215"><p>Barrels were origionally bored and then rifled. Bore diameter is, by definition, the size hole that gets precisely bored during manufactoring, groove diameter is to the bottom of the rifling. Ergo, a .30 cal barrel is bored to .300" and, with a normal rifling depth of 4 thou, the groove diameter is .308".</p><p> </p><p>Seating a precise amount off the lands isn't the goal, finding the best shooting jump to the lands is but that's a relitive thing,it matters not if we know to the last thou what it really is.</p><p> </p><p>A seating variation of +/- 5 thou rarely matters unless we're seating on a ragged edge of what works well..</p></blockquote><p></p>
[QUOTE="boomtube, post: 842405, member: 9215"] Barrels were origionally bored and then rifled. Bore diameter is, by definition, the size hole that gets precisely bored during manufactoring, groove diameter is to the bottom of the rifling. Ergo, a .30 cal barrel is bored to .300" and, with a normal rifling depth of 4 thou, the groove diameter is .308". Seating a precise amount off the lands isn't the goal, finding the best shooting jump to the lands is but that's a relitive thing,it matters not if we know to the last thou what it really is. A seating variation of +/- 5 thou rarely matters unless we're seating on a ragged edge of what works well.. [/QUOTE]
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