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Rifles, Reloading, Optics, Equipment
Reloading
Does anyone know at what pressure sticky bolt lift occurs?
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<blockquote data-quote="Mikecr" data-source="post: 2621138" data-attributes="member: 1521"><p>With a strain gage, and careful validation of the particular barrel steel as a standard, it's possible to get close on pressure.</p><p>But WE never really need that, as we can see when local pressure is a 'problem'. We all have different problems at different pressures.</p><p>This is normally well below a safety issue.</p><p></p><p>I use a chrono and QuickLoad, and I can see them follow each other.</p><p>If there is not a gun problem, or reloading/brass problem, I can see when I'm at or above SAAMI max, usually without a bolt lift issue. That's normal. This is .473 casehead cartridges at normal tenon diameters. For a WSSM cartridge I went with a magnum diameter tenon per BATs recommendation. And I believe that was a smart move (Savage also does this).</p><p></p><p>I also do testing which I coin as MyMax. This involves measure at new case web-lines as I go up in load.</p><p>I watch for growth that goes up, levels off, and then step changes upward. This indicates (to me) the point where FL sizing would be required to reuse a case (every cycle). I don't FL size.</p><p>So far this has correlated with just going past SAAMI max, per QuickLoad.</p><p>Thing is, I wouldn't get difficult bolt turn with this unless I kept going. Why would I keep going?</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2621138, member: 1521"] With a strain gage, and careful validation of the particular barrel steel as a standard, it's possible to get close on pressure. But WE never really need that, as we can see when local pressure is a 'problem'. We all have different problems at different pressures. This is normally well below a safety issue. I use a chrono and QuickLoad, and I can see them follow each other. If there is not a gun problem, or reloading/brass problem, I can see when I'm at or above SAAMI max, usually without a bolt lift issue. That's normal. This is .473 casehead cartridges at normal tenon diameters. For a WSSM cartridge I went with a magnum diameter tenon per BATs recommendation. And I believe that was a smart move (Savage also does this). I also do testing which I coin as MyMax. This involves measure at new case web-lines as I go up in load. I watch for growth that goes up, levels off, and then step changes upward. This indicates (to me) the point where FL sizing would be required to reuse a case (every cycle). I don't FL size. So far this has correlated with just going past SAAMI max, per QuickLoad. Thing is, I wouldn't get difficult bolt turn with this unless I kept going. Why would I keep going? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Does anyone know at what pressure sticky bolt lift occurs?
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