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belted cartridges
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<blockquote data-quote="Gregg C" data-source="post: 1687074" data-attributes="member: 103471"><p>Not a gunsmith. I may be off base here, but I believe the " headspace gauge" for a belted cartridge could more accurately be called a " belt space gauge". It does the same thing in that it locates the chamber in relation to the bolt face. If I understand this correctly, if the gauge is properly spaced, the chamber is correct. Must be go and no go gauges, for the belt, I mean. I'm also under the impression that some 'smiths fore go the expense of the gauges, and simply run the reamer into the barrel till the bolt closes on a case. Problem with that is, one could easily get the chamber too long, in effect, too much headspace. In the other direction, cutting till the bolt barely closes, in order to "short chamber" can cause problems, too. The belt on the case isn't machined, therefore the tolerances are pretty wide. So the bolt might close on some cases, but not on others. Happened to me. I chose to lapp my bolt till the chamber would close on all of my brass rather than return my rifle to a smith I was unhappy with. But that created another problem...primary extraction became in inadequate. As far as properly setting up dies, fire one round. That is your datum line control, just as if the cartridge had no belt. Adjust accordingly. Hope I got that out right.</p></blockquote><p></p>
[QUOTE="Gregg C, post: 1687074, member: 103471"] Not a gunsmith. I may be off base here, but I believe the " headspace gauge" for a belted cartridge could more accurately be called a " belt space gauge". It does the same thing in that it locates the chamber in relation to the bolt face. If I understand this correctly, if the gauge is properly spaced, the chamber is correct. Must be go and no go gauges, for the belt, I mean. I'm also under the impression that some 'smiths fore go the expense of the gauges, and simply run the reamer into the barrel till the bolt closes on a case. Problem with that is, one could easily get the chamber too long, in effect, too much headspace. In the other direction, cutting till the bolt barely closes, in order to "short chamber" can cause problems, too. The belt on the case isn't machined, therefore the tolerances are pretty wide. So the bolt might close on some cases, but not on others. Happened to me. I chose to lapp my bolt till the chamber would close on all of my brass rather than return my rifle to a smith I was unhappy with. But that created another problem...primary extraction became in inadequate. As far as properly setting up dies, fire one round. That is your datum line control, just as if the cartridge had no belt. Adjust accordingly. Hope I got that out right. [/QUOTE]
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