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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning your Brass
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<blockquote data-quote="tim_w" data-source="post: 1438970" data-attributes="member: 11132"><p>I like all my case necks to be consistent even if its a factory chamber with lots of clewrance still want the neck to release the bullet evenly and that is irrespective of the clearance. Thus I skim all necks for stock guns.</p><p></p><p>For customs I like cases necks to be min 0.010 max 0.015</p><p></p><p>Chamber clearance 0.002-0.004 depending on use cartisge and caliber.</p><p></p><p>I have a theory on why it seems some find increased clearance for neck work better where it seems some BR set records with as little as 0.001. Neck runout from the shoulder junction. With the case seated against the shoulder the more runout of the neck the closer it is to one side or a point of the cbamber neck wall. If you are using unturned necks even more so as now there are thicker and thinner areas. Running neck clearance 0.001 is only 0.0005 clearance. we have seen various sizing practices effecti various areas of the case in terms of alignment with its centerline. Expander balls always leads to some neck to shoulder runout. Neck sizing without full case support. Neck bushing dies miss the bottom of the neck. In a tight clearance can be enough to binding and changing the release force of the forward part of the neck that is holding the bullet.</p><p></p><p>Anyways just a theory. In the BR game where .001* dif is group skze can actually matter making everything perfect with tight neck clearance maybe that little be extra but everything better be perfect. Most of us do not shoot nor measure our groups to tbat level of accuracy let alone tell the difference.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1438970, member: 11132"] I like all my case necks to be consistent even if its a factory chamber with lots of clewrance still want the neck to release the bullet evenly and that is irrespective of the clearance. Thus I skim all necks for stock guns. For customs I like cases necks to be min 0.010 max 0.015 Chamber clearance 0.002-0.004 depending on use cartisge and caliber. I have a theory on why it seems some find increased clearance for neck work better where it seems some BR set records with as little as 0.001. Neck runout from the shoulder junction. With the case seated against the shoulder the more runout of the neck the closer it is to one side or a point of the cbamber neck wall. If you are using unturned necks even more so as now there are thicker and thinner areas. Running neck clearance 0.001 is only 0.0005 clearance. we have seen various sizing practices effecti various areas of the case in terms of alignment with its centerline. Expander balls always leads to some neck to shoulder runout. Neck sizing without full case support. Neck bushing dies miss the bottom of the neck. In a tight clearance can be enough to binding and changing the release force of the forward part of the neck that is holding the bullet. Anyways just a theory. In the BR game where .001* dif is group skze can actually matter making everything perfect with tight neck clearance maybe that little be extra but everything better be perfect. Most of us do not shoot nor measure our groups to tbat level of accuracy let alone tell the difference. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning your Brass
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