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Rifles, Reloading, Optics, Equipment
Reloading
Black soot on cases head scratcher for me???
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<blockquote data-quote="MLN1963" data-source="post: 2097139" data-attributes="member: 68159"><p>I'm going through the same thing right now with a 6 Creedmoor and a second lot of Berger 109s. The first ones shot great with no sign of leakage. The second lot is soot city. My leaky cases necks measure the same if only slightly bigger than a loaded case. My thought is the bullet is sliding out of the case too easily upon initial pressure and leaking pressure until the bullet hits the rifling slows or stops then builds pressure and seals up the leak. I'm getting good speed, 2977 FPS, and accuracy with no load development.</p><p></p><p>The second lot, older numerically, has a bit of a pressure ring and I believe it's enough to stretch the neck a bit more and allow the bullet to start moving easier/sooner. I FLS my annealed cases without expander and mandrel the necks to size. I use a turning mandrel, .241", set tension. I believe more neck tension is needed. I want to try a .240" mandrel to see if that will cause the billet to stay put longer and solve the leakage problem. 21st Century offers one but says all orders are at least 4 weeks before shipping thanks to COVID and the political climate. I don't want to wait that long for a test. I tried some DTACs wish have .098" longer BTO and are still in the neck when they hit the rifling and they don't have leakage. The original 109s I shot measure .243" and don't have issues, the new to me lot measures .2345" and cause issues. This is likely not being helped any by the long jump caused by the SAAMI spec .183" free bore</p><p></p><p>I've been in contact with Berger and they are befuddled as well. They think I'm onto something with the releasing too early theory, but as of now we can't prove it. They did say that they do not design in pressure rings to their bullets. It happens occasionally depending on many factors in the bullet making process.</p></blockquote><p></p>
[QUOTE="MLN1963, post: 2097139, member: 68159"] I’m going through the same thing right now with a 6 Creedmoor and a second lot of Berger 109s. The first ones shot great with no sign of leakage. The second lot is soot city. My leaky cases necks measure the same if only slightly bigger than a loaded case. My thought is the bullet is sliding out of the case too easily upon initial pressure and leaking pressure until the bullet hits the rifling slows or stops then builds pressure and seals up the leak. I’m getting good speed, 2977 FPS, and accuracy with no load development. The second lot, older numerically, has a bit of a pressure ring and I believe it’s enough to stretch the neck a bit more and allow the bullet to start moving easier/sooner. I FLS my annealed cases without expander and mandrel the necks to size. I use a turning mandrel, .241”, set tension. I believe more neck tension is needed. I want to try a .240” mandrel to see if that will cause the billet to stay put longer and solve the leakage problem. 21st Century offers one but says all orders are at least 4 weeks before shipping thanks to COVID and the political climate. I don’t want to wait that long for a test. I tried some DTACs wish have .098” longer BTO and are still in the neck when they hit the rifling and they don’t have leakage. The original 109s I shot measure .243” and don’t have issues, the new to me lot measures .2345” and cause issues. This is likely not being helped any by the long jump caused by the SAAMI spec .183” free bore I’ve been in contact with Berger and they are befuddled as well. They think I’m onto something with the releasing too early theory, but as of now we can’t prove it. They did say that they do not design in pressure rings to their bullets. It happens occasionally depending on many factors in the bullet making process. [/QUOTE]
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Black soot on cases head scratcher for me???
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