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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity - setting up dies - runout
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<blockquote data-quote="boomtube" data-source="post: 507129" data-attributes="member: 9215"><p><em>"the lubricity of the case ... More and slipperier lube means it'll be shorter; less and more sticky and it'll be longer."</em></p><p> </p><p>Interesting and surprising fact isn't it? One reason I've gone to Imperial and Unique lubes is that I can actually control how much is on my cases with finger tip application quite well and I never could be consistant when using a lube pad. Another factor is work hardened cases; new (or recently annealed) cases won't springback as much as those that have been fired several times.</p><p> </p><p> </p><p><em>"Every press known to man has some spring in it, but my Rockchuckers are at the lower end."</em></p><p> </p><p>Another interesting fact that's often misunderstood. And the press linkages also have some varing amounts of slack and the oil in the pins also seems to matter, especially if we operate the lever at variable speeds.</p><p> </p><p>As an amateur home shop mechanist I have the right tools to properly measure press spring. Many years back I bought two little Lee RELOADER presses for de- and re-priming and was curious about their spring. Used the same box of fired .30-06 cases and same die/shell holder adjusted to FL size 4-5 cases to the same point in both of the tiny alum alloy C presses and then in my RC II. Surprised me that the RC lifted more than 2.5 thou at the top of the sizing stroke but there wasn't enough spring in either of the Lee's to measure, it was well under a thou! Point being that alum alloy is actually more rigid within it's tensile strength limits than cast iron but that is NOT the way Lee's light alloy presses are presumed to be! (I've gotten some howls of outrage from people who insist their cast iron RC is totally rigid and that Lee's presses are 'soft and flexible" - not so! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> )</p><p> </p><p></p><p>6X6 is correct that the rhythm of press operation can matter, at least as much as a couple of thou at the shoulders or in OAL. Only after I got my first RCBS Precision Case Mic and could actually measure the effects of varying lever technique did I imagine it would be so easily changable. Slowing down and pacing myself obtains much more consistant results than my previous rather inconsistant lever practices. Not that I've ever seen any differences in acccuracy from such tiny variations.</p></blockquote><p></p>
[QUOTE="boomtube, post: 507129, member: 9215"] [I]"the lubricity of the case ... More and slipperier lube means it'll be shorter; less and more sticky and it'll be longer."[/I] Interesting and surprising fact isn't it? One reason I've gone to Imperial and Unique lubes is that I can actually control how much is on my cases with finger tip application quite well and I never could be consistant when using a lube pad. Another factor is work hardened cases; new (or recently annealed) cases won't springback as much as those that have been fired several times. [I]"Every press known to man has some spring in it, but my Rockchuckers are at the lower end."[/I] Another interesting fact that's often misunderstood. And the press linkages also have some varing amounts of slack and the oil in the pins also seems to matter, especially if we operate the lever at variable speeds. As an amateur home shop mechanist I have the right tools to properly measure press spring. Many years back I bought two little Lee RELOADER presses for de- and re-priming and was curious about their spring. Used the same box of fired .30-06 cases and same die/shell holder adjusted to FL size 4-5 cases to the same point in both of the tiny alum alloy C presses and then in my RC II. Surprised me that the RC lifted more than 2.5 thou at the top of the sizing stroke but there wasn't enough spring in either of the Lee's to measure, it was well under a thou! Point being that alum alloy is actually more rigid within it's tensile strength limits than cast iron but that is NOT the way Lee's light alloy presses are presumed to be! (I've gotten some howls of outrage from people who insist their cast iron RC is totally rigid and that Lee's presses are 'soft and flexible" - not so! :D ) 6X6 is correct that the rhythm of press operation can matter, at least as much as a couple of thou at the shoulders or in OAL. Only after I got my first RCBS Precision Case Mic and could actually measure the effects of varying lever technique did I imagine it would be so easily changable. Slowing down and pacing myself obtains much more consistant results than my previous rather inconsistant lever practices. Not that I've ever seen any differences in acccuracy from such tiny variations. [/QUOTE]
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Concentricity - setting up dies - runout
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