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Rifles, Reloading, Optics, Equipment
Reloading
headspace challenge.
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<blockquote data-quote="SidecarFlip" data-source="post: 887864" data-attributes="member: 39764"><p>Kinda suprised you could 'mill' the shellholder face in as much as good shell holders are case hardened. High Rockwell and milling don't work well together.</p><p> </p><p>Now, if you said, I 'surface ground' the shellholder, thats more believable.</p><p> </p><p>Shawn.... What I suggest, rather than reducing the shellholder height to obtain the 'bump' from the die, is to carefully grind the bottom of your FL die off. IU grind mine on my high precision surface grinder but you can hand grind it if you are careful and check often for overall length.</p><p> </p><p>Be apprised that once you grind it, it's 'yours'. It's not resellable on Flea Bay or anywhere else, but then, I don't sell my die sets anyway.</p><p> </p><p>The problem with reducing the overall height of a shell holder is being able to fixture it and grinding it so both the upper and lower surfaces are parallel.</p><p> </p><p>When I grind mine, I fixture the shellholder or the die (base up) in an appropriate collet secured in a spin index fixtured on a magnetic chuck at exactly 90 degrees in relationship to the lineal travel of the table.</p><p> </p><p>In that position, the base of the die or the surface of the shellholder stays true and parallel at all times and it's easy to remove exactly the amount of material you want to, to achieve the desired 'bump'.</p><p> </p><p>I typically cut my dies 0.015 (after ascertaining just how much bump (setback) the dies will effectuate in stock form. keep in mind that all dies are not the same and some dies will set back shoulders more than others, even dies from the same manufacturer made at different times because the overall dimension from the top of the die, to the base is not considered a critical dimension so overall height varies.</p><p> </p><p>I know that all sounds complex.</p><p> </p><p>The easiest way to ascertain if, the die is setting back the shoulder and how much is using a headspace gage. The die will only set back whatever distance is obtainable when the die is in a 'cam over' position in the press, but once you grind the die base or shell holder, camming over becomes a thing of the past. </p><p>I never cam over my press to bump.</p><p> </p><p>I typically set back 0.001 to 0.002 to achieve proper chambering and no, I don't get brass on my bolt face.......<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 887864, member: 39764"] Kinda suprised you could 'mill' the shellholder face in as much as good shell holders are case hardened. High Rockwell and milling don't work well together. Now, if you said, I 'surface ground' the shellholder, thats more believable. Shawn.... What I suggest, rather than reducing the shellholder height to obtain the 'bump' from the die, is to carefully grind the bottom of your FL die off. IU grind mine on my high precision surface grinder but you can hand grind it if you are careful and check often for overall length. Be apprised that once you grind it, it's 'yours'. It's not resellable on Flea Bay or anywhere else, but then, I don't sell my die sets anyway. The problem with reducing the overall height of a shell holder is being able to fixture it and grinding it so both the upper and lower surfaces are parallel. When I grind mine, I fixture the shellholder or the die (base up) in an appropriate collet secured in a spin index fixtured on a magnetic chuck at exactly 90 degrees in relationship to the lineal travel of the table. In that position, the base of the die or the surface of the shellholder stays true and parallel at all times and it's easy to remove exactly the amount of material you want to, to achieve the desired 'bump'. I typically cut my dies 0.015 (after ascertaining just how much bump (setback) the dies will effectuate in stock form. keep in mind that all dies are not the same and some dies will set back shoulders more than others, even dies from the same manufacturer made at different times because the overall dimension from the top of the die, to the base is not considered a critical dimension so overall height varies. I know that all sounds complex. The easiest way to ascertain if, the die is setting back the shoulder and how much is using a headspace gage. The die will only set back whatever distance is obtainable when the die is in a 'cam over' position in the press, but once you grind the die base or shell holder, camming over becomes a thing of the past. I never cam over my press to bump. I typically set back 0.001 to 0.002 to achieve proper chambering and no, I don't get brass on my bolt face.......:) [/QUOTE]
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