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The Range
Ammo & Reloading
Different seating pressures
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<blockquote data-quote="swampratt" data-source="post: 3588429" data-attributes="member: 15054"><p>I measured all necks for ID measurement and for OD measurements.</p><p>If I have .001" difference I do not use that brass to shoot a group with in load testing.</p><p>In fact if I have a case with 1/2 of a thousandths difference I will not use it in load testing.</p><p></p><p>What happened here is I had Lapua cases and some were annealed and then sized and I had some others that were not annealed.</p><p></p><p>I thought I will just anneal the already sized cases and brush the insides of the necks and load them.</p><p>I began loading them and WOW the pressures to seat a round were very high.</p><p>I took a few of those cases and ran them back through the Full Length sizing die and brushed the insides of the necks again.</p><p>Seating pressures were lower.</p><p>Those got mixed in with the other Lapua cases and I felt the differences in seating pressures.</p><p></p><p>I do have a small valve spring pressure tester I can use and see exactly what pressures are when seating.</p><p>I do not use it except for experiments or valve springs.</p><p></p><p>I will agree Lapua cases have very even seating pressures and even after dozens of reloads the seating pressures are </p><p>almost the same as once fired.</p><p>This is without annealing at all.</p><p></p><p>But i have shot groups with the same load with annealed Lapua and not annealed and I get tighter groups and minimal fliers</p><p>with annealed each time Lapua cases.. same goes for any brand case I have shot.</p><p></p><p>I have tried .001" neck tension(interference fit) .0015" .002" and .003" I have found .003" works best for me and my guns.</p><p>I do not crimp.</p><p>I tried and it did not help my groups any at all.</p><p></p><p>I also tried .004-.005-.008" neck tension and those just work the brass in a negative way.</p><p>Too much and you remove some of the spring back because you are removing the annealing benefits.</p><p></p><p></p><p>I will explain that a bit.</p><p>At .008" neck tension seating the bullet took a lot of pressure but as the bullet base got past the neck and into the shoulder</p><p>the seating pressures dropped. and it dropped below where the .004" case was at.</p><p></p><p>So I removed the .308 bullet from the case with an inertia puller and measured case ID it was .0005" smaller than bullet OD.</p><p>So .3075" ID</p><p>The .003" interference fit would have .001" interference fit after pulling a bullet and the .004" was sometimes .001" and sometimes less. So .004" was a bit iffy.</p><p></p><p>If crimping works for you guys then by all means add a crimp.</p><p>There are dozens of ways to get there.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3588429, member: 15054"] I measured all necks for ID measurement and for OD measurements. If I have .001" difference I do not use that brass to shoot a group with in load testing. In fact if I have a case with 1/2 of a thousandths difference I will not use it in load testing. What happened here is I had Lapua cases and some were annealed and then sized and I had some others that were not annealed. I thought I will just anneal the already sized cases and brush the insides of the necks and load them. I began loading them and WOW the pressures to seat a round were very high. I took a few of those cases and ran them back through the Full Length sizing die and brushed the insides of the necks again. Seating pressures were lower. Those got mixed in with the other Lapua cases and I felt the differences in seating pressures. I do have a small valve spring pressure tester I can use and see exactly what pressures are when seating. I do not use it except for experiments or valve springs. I will agree Lapua cases have very even seating pressures and even after dozens of reloads the seating pressures are almost the same as once fired. This is without annealing at all. But i have shot groups with the same load with annealed Lapua and not annealed and I get tighter groups and minimal fliers with annealed each time Lapua cases.. same goes for any brand case I have shot. I have tried .001" neck tension(interference fit) .0015" .002" and .003" I have found .003" works best for me and my guns. I do not crimp. I tried and it did not help my groups any at all. I also tried .004-.005-.008" neck tension and those just work the brass in a negative way. Too much and you remove some of the spring back because you are removing the annealing benefits. I will explain that a bit. At .008" neck tension seating the bullet took a lot of pressure but as the bullet base got past the neck and into the shoulder the seating pressures dropped. and it dropped below where the .004" case was at. So I removed the .308 bullet from the case with an inertia puller and measured case ID it was .0005" smaller than bullet OD. So .3075" ID The .003" interference fit would have .001" interference fit after pulling a bullet and the .004" was sometimes .001" and sometimes less. So .004" was a bit iffy. If crimping works for you guys then by all means add a crimp. There are dozens of ways to get there. [/QUOTE]
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