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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning
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<blockquote data-quote="Mikecr" data-source="post: 2810034" data-attributes="member: 1521"><p>Your chamber neck is ~.298 and your loaded necks are .290? </p><p>~8thou neck clearance? You downsize 7thou + desired interference with FL sizing?</p><p></p><p>Cnkhunting, you should carefully measure your brass, find the mean, and cull out offenders. </p><p>Determine your existing chamber clearance and decide if you need to turn anything -or if that would be the worst thing you could do.</p><p>Neck turning is not automatically the right thing to do.</p><p></p><p>To measure neck thickness correctly you need to pick & set a datum point. Half way down the neck should be fine.</p><p>If you allow the datum in measure to shift, then thickness readings will shift, as brass tapers in thickness from webs to mouths.</p><p>And as you measure radially around necks, note extremes in thickness variance. Thickness variance also runs webs to mouths.</p><p>This thickness variance and sizing of it causes runout. So if you size case bodies having a lot of thickness variance, your runout will grow regardless of neck turning. Best to cull it out same as culling out overall thickness departures from mean.</p><p>Doing this correctly will buy you way more than neck turning.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2810034, member: 1521"] Your chamber neck is ~.298 and your loaded necks are .290? ~8thou neck clearance? You downsize 7thou + desired interference with FL sizing? Cnkhunting, you should carefully measure your brass, find the mean, and cull out offenders. Determine your existing chamber clearance and decide if you need to turn anything -or if that would be the worst thing you could do. Neck turning is not automatically the right thing to do. To measure neck thickness correctly you need to pick & set a datum point. Half way down the neck should be fine. If you allow the datum in measure to shift, then thickness readings will shift, as brass tapers in thickness from webs to mouths. And as you measure radially around necks, note extremes in thickness variance. Thickness variance also runs webs to mouths. This thickness variance and sizing of it causes runout. So if you size case bodies having a lot of thickness variance, your runout will grow regardless of neck turning. Best to cull it out same as culling out overall thickness departures from mean. Doing this correctly will buy you way more than neck turning. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning
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