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Rifles, Reloading, Optics, Equipment
Reloading
Best reloader for Precision long range?
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<blockquote data-quote="Bart B" data-source="post: 1148401" data-attributes="member: 5302"><p>I get virtually zero spread in seating depth with both die types across different makes' that's very consistent to me.</p><p></p><p>All seater dies set to push bullets into sized cases do so with very consistent case head to the reference diameter on the bullet's ogive where the seater plug's contacted it. All you need to do is use a caliper and bushing to measure the distance from case head to where that bushing touches the bullet's ogive. The bushing's inside diameter has to be the same as the seater plug diameter at bullet contact point.</p><p></p><p>The advantage seaters with micrometer type depth adjustments have is it's easier to make a .002" change. Standard seaters typically have 1/4" 28 tpi stems that adjust .036" per turn. Twist it 1/18th of a turn (20 degrees) and that'll change its position .002". Micrometer ones have .001" increments marked on a thimble much larger in diameter than the standard seater stems at 1/4".</p><p></p><p>With all rimless bottleneck cases properly resized then loaded with bullets so seated to even a zero spread, they'll typically still have a few to several thousandths inch spread in how far they have to move out of the case neck before they touch the rifling. </p><p></p><p>Why is that possible?</p><p></p><p>And the rifling at its origin erodes away .001" for every 10 to 40 or so rounds of its life; to some, that makes a difference as bullet jump increases at that rate.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1148401, member: 5302"] I get virtually zero spread in seating depth with both die types across different makes' that's very consistent to me. All seater dies set to push bullets into sized cases do so with very consistent case head to the reference diameter on the bullet's ogive where the seater plug's contacted it. All you need to do is use a caliper and bushing to measure the distance from case head to where that bushing touches the bullet's ogive. The bushing's inside diameter has to be the same as the seater plug diameter at bullet contact point. The advantage seaters with micrometer type depth adjustments have is it's easier to make a .002" change. Standard seaters typically have 1/4" 28 tpi stems that adjust .036" per turn. Twist it 1/18th of a turn (20 degrees) and that'll change its position .002". Micrometer ones have .001" increments marked on a thimble much larger in diameter than the standard seater stems at 1/4". With all rimless bottleneck cases properly resized then loaded with bullets so seated to even a zero spread, they'll typically still have a few to several thousandths inch spread in how far they have to move out of the case neck before they touch the rifling. Why is that possible? And the rifling at its origin erodes away .001" for every 10 to 40 or so rounds of its life; to some, that makes a difference as bullet jump increases at that rate. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Best reloader for Precision long range?
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