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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber wont close
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<blockquote data-quote="Steve Shelp" data-source="post: 26171" data-attributes="member: 22"><p>Smoak,</p><p> Brent is right and here's why. I think what you are seeing is the case "headspace" is growing when you sized them. These bigger cases will grow on you when only sized a little without true shoulder bumping. </p><p> I've noticed this issue with my 338 Yogi. If you only FL size the case without bumping the shoulder, when the body gets squeezed in, that stress pushes the shoulder forward a little. This can be fixed by slowly screwing your FL die down at little at a time, relube/resize your case, chamber it and see if it's still sticky. If it is turn your die another thousands or so and keep trying until your bolt flops down easily. Lock your die's locking ring in place and you shouldn't have any problems in the future. Being that Brent doesn't see this problem when only neck sizing.... backs up this also, becasue the body isn't being squeezed in and the shoulder doesn't grow becasue of this.</p><p> For the loaded rounds, if you use a bushing die.... removing the decapping pin assembly and the neck bushing and follow the above steps with the loaded rounds. If you aren't using a bushing die, the bullets will need to be pulled and then resize the cases. Becareful..... you are putting a primed and charged case inside a steel "chamber" with a small hole coming out the top. I've done this before without incident... just be aware of the possible problems.</p><p></p><p>If you have a Stoney Point Bullet comparitor that will fit over the neck diameter of your RUM cases, you can easy see if this is the issue by measuring a datum point anywhere on a fired/sized and fired/not sized case. I believe you will find the shoulder is longer on the fired/sized case by a thousnads or more after sizing with your dies setup the way they are now. </p><p></p><p>That would be my edumekated guess based on experience anyway <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>Steve</p><p></p><p>[ 03-30-2003: Message edited by: Steve Shelp ]</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 26171, member: 22"] Smoak, Brent is right and here's why. I think what you are seeing is the case "headspace" is growing when you sized them. These bigger cases will grow on you when only sized a little without true shoulder bumping. I've noticed this issue with my 338 Yogi. If you only FL size the case without bumping the shoulder, when the body gets squeezed in, that stress pushes the shoulder forward a little. This can be fixed by slowly screwing your FL die down at little at a time, relube/resize your case, chamber it and see if it's still sticky. If it is turn your die another thousands or so and keep trying until your bolt flops down easily. Lock your die's locking ring in place and you shouldn't have any problems in the future. Being that Brent doesn't see this problem when only neck sizing.... backs up this also, becasue the body isn't being squeezed in and the shoulder doesn't grow becasue of this. For the loaded rounds, if you use a bushing die.... removing the decapping pin assembly and the neck bushing and follow the above steps with the loaded rounds. If you aren't using a bushing die, the bullets will need to be pulled and then resize the cases. Becareful..... you are putting a primed and charged case inside a steel "chamber" with a small hole coming out the top. I've done this before without incident... just be aware of the possible problems. If you have a Stoney Point Bullet comparitor that will fit over the neck diameter of your RUM cases, you can easy see if this is the issue by measuring a datum point anywhere on a fired/sized and fired/not sized case. I believe you will find the shoulder is longer on the fired/sized case by a thousnads or more after sizing with your dies setup the way they are now. That would be my edumekated guess based on experience anyway [img]images/icons/grin.gif[/img] Steve [ 03-30-2003: Message edited by: Steve Shelp ] [/QUOTE]
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