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Rifles, Reloading, Optics, Equipment
Reloading
Tight chamber or what?
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<blockquote data-quote="BountyHunter" data-source="post: 1094151" data-attributes="member: 12"><p>Even chambered with the same reamer, there could be major differences in headspace between the two chambers just due to how the gunsmiths did the chamber and measured it.</p><p></p><p>Also, will strongly disagree with the recommendation to have the die touch the shellholder. That is the mftrs instructions and yes, it takes the brass back to SAAMI or even more, but routinely leads to excess headspace and brass separation as a result. Plus 3 times I have seen it push the shoulder back to the point it bulges out slightly at the edge causing non chambering. It is very hard to see if at all, but there will be a little ridge that can be felt with a metal straight edge. That is often hard to diagnose because people follow the mftrs instructions and think that something else is wrong. You can check by taking a piece of fired brass, back the die off .020 and sizing down until it chambers if that is the problem.</p><p></p><p>Bolt guns should be set up to have about .001-.002 pushback and semis most run it to .003. Depending on the chamber you might have to use a small base die in autos.</p><p></p><p>Read this how to do it properly. </p><p> <a href="http://www.longrangehunting.com/forums/f28/how-set-up-fl-sizing-dies-one-masters-game-153072/" target="_blank">http://www.longrangehunting.com/forums/f28/how-set-up-fl-sizing-dies-one-masters-game-153072/</a></p><p></p><p>If you have the tools to accurately measure headspace and find the two guns are different you can buy a set of "Skip Otto Die Shims) about $15 and set the die up for the shortest headspace and then just use the appropriate shim under the die for the next gun. That way you can use one die set for multiple guns with accurate headspace for each.</p><p></p><p>It is not uncommon for the die to be too long and about .020 have to be ground off as they ran the reamer in too deep.</p><p></p><p>You also might have a burr in the chamber of the one so check that out as you have run the headspacing in and out. Sounds like a defect in the chamber of some kind.</p></blockquote><p></p>
[QUOTE="BountyHunter, post: 1094151, member: 12"] Even chambered with the same reamer, there could be major differences in headspace between the two chambers just due to how the gunsmiths did the chamber and measured it. Also, will strongly disagree with the recommendation to have the die touch the shellholder. That is the mftrs instructions and yes, it takes the brass back to SAAMI or even more, but routinely leads to excess headspace and brass separation as a result. Plus 3 times I have seen it push the shoulder back to the point it bulges out slightly at the edge causing non chambering. It is very hard to see if at all, but there will be a little ridge that can be felt with a metal straight edge. That is often hard to diagnose because people follow the mftrs instructions and think that something else is wrong. You can check by taking a piece of fired brass, back the die off .020 and sizing down until it chambers if that is the problem. Bolt guns should be set up to have about .001-.002 pushback and semis most run it to .003. Depending on the chamber you might have to use a small base die in autos. Read this how to do it properly. [url]http://www.longrangehunting.com/forums/f28/how-set-up-fl-sizing-dies-one-masters-game-153072/[/url] If you have the tools to accurately measure headspace and find the two guns are different you can buy a set of "Skip Otto Die Shims) about $15 and set the die up for the shortest headspace and then just use the appropriate shim under the die for the next gun. That way you can use one die set for multiple guns with accurate headspace for each. It is not uncommon for the die to be too long and about .020 have to be ground off as they ran the reamer in too deep. You also might have a burr in the chamber of the one so check that out as you have run the headspacing in and out. Sounds like a defect in the chamber of some kind. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Tight chamber or what?
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