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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet/case neck run out
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<blockquote data-quote="jmden" data-source="post: 36059" data-attributes="member: 1742"><p>Roper and Mikecr, thanks for your replies. </p><p></p><p>I've thought some more about this problem and did some more reading and have done three things: </p><p></p><p>1) neck turn (I use Sinclairs 3000 turner and their special sizing mandrel beforehand.) a second time after firing. I was so careful the first time that I was amazed to see as much brass as came off the second turning. I did not adjust the cutter at all, in fact, when I saw how much brass was coming off I double checked to make sure the cutter was tight and hadn't moved.</p><p></p><p>2) Cleaned my dies extra carefully.</p><p></p><p>3) I chucked the expander rod in my drill press and at a slow speed used 800 then 1500 grit paper to polish it. Not too much, just a little. I did the same with the bullet seater, polishing the area when the seater contacts the bullet.</p><p></p><p>After FL sizing, all the cases (save one--which I'll probably end up pitching) had an average .001 runout some just a smidgen more some a smidgen less (using the Sinclair concentricity guage). (This is on a Rockchucker press with standard Redding dies with expander rod and shellholder floating and every bearing surface cleaned carefully. I clean and lube where the shellholder meets the ram so that it can float "easily".) After bullet seating the case neck runout varied just a bit more--anywhere from .00075 to .0015 with and average just a smidgen over .001. Bullet runout measured 1/16" in front of the case end was averaging just barely over .001 with a range of .00075 to .002. I think I can live with that. After all, this is just a hunting rig...</p><p></p><p>The expander opens the necks up to .304 (every single one exactly--outside is .335 exactly!) and my Accubonds measure just a hair under .308 so my necks are expanding .004 during the bullet seating operation. I'm wondering if there is anyone who can comment on this amount (.004) neck expansion (and associated neck tension)during the bullet seating operation?</p><p></p><p>Thanks,</p><p></p><p>Jon Denham</p></blockquote><p></p>
[QUOTE="jmden, post: 36059, member: 1742"] Roper and Mikecr, thanks for your replies. I've thought some more about this problem and did some more reading and have done three things: 1) neck turn (I use Sinclairs 3000 turner and their special sizing mandrel beforehand.) a second time after firing. I was so careful the first time that I was amazed to see as much brass as came off the second turning. I did not adjust the cutter at all, in fact, when I saw how much brass was coming off I double checked to make sure the cutter was tight and hadn't moved. 2) Cleaned my dies extra carefully. 3) I chucked the expander rod in my drill press and at a slow speed used 800 then 1500 grit paper to polish it. Not too much, just a little. I did the same with the bullet seater, polishing the area when the seater contacts the bullet. After FL sizing, all the cases (save one--which I'll probably end up pitching) had an average .001 runout some just a smidgen more some a smidgen less (using the Sinclair concentricity guage). (This is on a Rockchucker press with standard Redding dies with expander rod and shellholder floating and every bearing surface cleaned carefully. I clean and lube where the shellholder meets the ram so that it can float "easily".) After bullet seating the case neck runout varied just a bit more--anywhere from .00075 to .0015 with and average just a smidgen over .001. Bullet runout measured 1/16" in front of the case end was averaging just barely over .001 with a range of .00075 to .002. I think I can live with that. After all, this is just a hunting rig... The expander opens the necks up to .304 (every single one exactly--outside is .335 exactly!) and my Accubonds measure just a hair under .308 so my necks are expanding .004 during the bullet seating operation. I'm wondering if there is anyone who can comment on this amount (.004) neck expansion (and associated neck tension)during the bullet seating operation? Thanks, Jon Denham [/QUOTE]
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bullet/case neck run out
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