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Rifles, Reloading, Optics, Equipment
Reloading
Measuring Distance Into the Lands
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<blockquote data-quote="QuietTexan" data-source="post: 2313810" data-attributes="member: 116181"><p>Unpopular answer:</p><p></p><p>There's no such thing as seating "into the lands", there's only seating "further than wherever the person measuring decided to stop to pushing" based on what they're using for tension/interference fit or how they're measuring. There's a big presumption about concentricity implicit to measuring this relationship - if anything isn't concentric, including the end of each separate land of rifling, the bullet jacket, and the neck of the bullet, then the actual interface point will change every shot. Over the life of a bore who really thinks a throat erodes perfectly concentrically?</p><p></p><p>So either 1 - jam the bullet in hard until all the variables are reduced to the most difficult to overcome (aka would seat a bullet back into the neck against interference fit), or 2 - jump the bullet and don't worry about trying to get an absolute measurement to the lands, use the initial measurements to create a reference point that in and of itself means nothing while focusing on what works the best for your goal, be that absolute precision or a longer useful life of a seating depth.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2313810, member: 116181"] Unpopular answer: There's no such thing as seating "into the lands", there's only seating "further than wherever the person measuring decided to stop to pushing" based on what they're using for tension/interference fit or how they're measuring. There's a big presumption about concentricity implicit to measuring this relationship - if anything isn't concentric, including the end of each separate land of rifling, the bullet jacket, and the neck of the bullet, then the actual interface point will change every shot. Over the life of a bore who really thinks a throat erodes perfectly concentrically? So either 1 - jam the bullet in hard until all the variables are reduced to the most difficult to overcome (aka would seat a bullet back into the neck against interference fit), or 2 - jump the bullet and don't worry about trying to get an absolute measurement to the lands, use the initial measurements to create a reference point that in and of itself means nothing while focusing on what works the best for your goal, be that absolute precision or a longer useful life of a seating depth. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Measuring Distance Into the Lands
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