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Rifles, Reloading, Optics, Equipment
Reloading
Measure this and measure that.
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<blockquote data-quote="Brent" data-source="post: 67963" data-attributes="member: 99"><p>[ QUOTE ]</p><p> Would a longer BS corespond to a bullet with a larger diameter? By my thinking it should and if so I might be able to sort bullets based on diameter since I have a micrometer but I don't have a bunch of money for the other fancy gauges.</p><p></p><p>[/ QUOTE ] </p><p></p><p>I'll say that it most likely would not effect bearing surface length, and here's why. To measure BS length a basic tool is used in order to engauge the bullet at a specific diameter on both ends. For a 30 caliber a hole with an ID of .300" is used and will engauge the bullet at approximately the same location on the ogive as the rifling would, the same ID hole is used to slip over the boattail as well. So, the two inserts with these .300" ID holes in them basically tell you how close the "near top" of the boattail is in relation to the "near bottom" of the ogive and thus the approximate bearing length that will be "engraved" by the rifling upon firing. </p><p></p><p>If you have the capability to bore the .300" holes (or whatever ID you need) in these inserts you can think of many ways to creatively use a caliper of dial indicator to read the bearing length. You'll just need to keep things lined up and consistant, and remember these measurments are just relative to one another. </p><p></p><p>In a nutshell though, the OD of the bullet will not tell you the length that will be engraved. It may tell you by your own experience if a bullet will foul excessively if it is too large or some other thing you attribute to its larger diameter, and possibly help weed out some bad eggs if you do sort this way. One thing to remember though is that most bullets are not uniform in diameter along the bearing length and you'd have to decide where to measure them for comparison, then if they varied (or did not vary) in the other area you did not measure, the question what to do arises.</p></blockquote><p></p>
[QUOTE="Brent, post: 67963, member: 99"] [ QUOTE ] Would a longer BS corespond to a bullet with a larger diameter? By my thinking it should and if so I might be able to sort bullets based on diameter since I have a micrometer but I don't have a bunch of money for the other fancy gauges. [/ QUOTE ] I'll say that it most likely would not effect bearing surface length, and here's why. To measure BS length a basic tool is used in order to engauge the bullet at a specific diameter on both ends. For a 30 caliber a hole with an ID of .300" is used and will engauge the bullet at approximately the same location on the ogive as the rifling would, the same ID hole is used to slip over the boattail as well. So, the two inserts with these .300" ID holes in them basically tell you how close the "near top" of the boattail is in relation to the "near bottom" of the ogive and thus the approximate bearing length that will be "engraved" by the rifling upon firing. If you have the capability to bore the .300" holes (or whatever ID you need) in these inserts you can think of many ways to creatively use a caliper of dial indicator to read the bearing length. You'll just need to keep things lined up and consistant, and remember these measurments are just relative to one another. In a nutshell though, the OD of the bullet will not tell you the length that will be engraved. It may tell you by your own experience if a bullet will foul excessively if it is too large or some other thing you attribute to its larger diameter, and possibly help weed out some bad eggs if you do sort this way. One thing to remember though is that most bullets are not uniform in diameter along the bearing length and you'd have to decide where to measure them for comparison, then if they varied (or did not vary) in the other area you did not measure, the question what to do arises. [/QUOTE]
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Reloading
Measure this and measure that.
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