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Rifles, Reloading, Optics, Equipment
Reloading
I seriously doubt this is case head separation but what do you guys think?
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<blockquote data-quote="Barrelnut" data-source="post: 1410876" data-attributes="member: 74902"><p>Sherm, before you pack your bags. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> Have a look at post #60 below. Lots of noise on this thread, but, to me, looks like the cases are <u>only growing a total of .006 ~ .008 after the first firing.</u> IMO, that is most likely being caused by the expander ball dragging on the neck and stretching it when the expander exits the case neck....</p><p></p><p>I just finished FL sizing fifty 6.5 Creedmoor Hornady cases. Bump back was .001~.002. Total case length was about .001~.002 longer after sizing. That means the expander (and brass flow) grew the neck .001~.003. That's on some brass that's on the sixth firing (annealed at 4). I also didn't clean the brass. So the necks are lubed with carbon from the last firing. Also I'm using a bushing die with about a .002 bushing and an expander ball.</p><p></p><p>Now consider that the OP is using a regular sizing die. I think that standard die is stretching the neck more. Add that to the fact (as Bigedp51 seems to think) the die doesn't match the chamber too well, you end up with a case that has a total length that is .006 after firing.</p><p></p><p>Hope that makes sense..</p></blockquote><p></p>
[QUOTE="Barrelnut, post: 1410876, member: 74902"] Sherm, before you pack your bags. ;) Have a look at post #60 below. Lots of noise on this thread, but, to me, looks like the cases are [U]only growing a total of .006 ~ .008 after the first firing.[/U] IMO, that is most likely being caused by the expander ball dragging on the neck and stretching it when the expander exits the case neck.... I just finished FL sizing fifty 6.5 Creedmoor Hornady cases. Bump back was .001~.002. Total case length was about .001~.002 longer after sizing. That means the expander (and brass flow) grew the neck .001~.003. That's on some brass that's on the sixth firing (annealed at 4). I also didn't clean the brass. So the necks are lubed with carbon from the last firing. Also I'm using a bushing die with about a .002 bushing and an expander ball. Now consider that the OP is using a regular sizing die. I think that standard die is stretching the neck more. Add that to the fact (as Bigedp51 seems to think) the die doesn't match the chamber too well, you end up with a case that has a total length that is .006 after firing. Hope that makes sense.. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
I seriously doubt this is case head separation but what do you guys think?
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