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Rifles, Reloading, Optics, Equipment
Reloading
Hidden Pressure Reading: A Method
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<blockquote data-quote="nksmfamjp" data-source="post: 2875850" data-attributes="member: 1951"><p>That is an interesting statement and I'll take you at your word about this 200000 psi yield strength.</p><p></p><p>That said, I think you have a point here. I'm not an action designer, but if I were, I would design the action to handle bolt thrust as a fatigue loading. Ideally since a barrel is a pressure vessel loaded in a fatigue loading. I would look at is from a UTS standpoint, wanting a factor of safety of 4 for a largest diameter bolt face loaded by a 65000 psi cartridge. I would also consider fatigue whose analysis usually work around a 1 million cycle consideration….which tend to be close to a FOS or 4.</p><p></p><p>Of course you have to test. I guess I would have to pay someone with an Instron to test for single force loading to tell me bolt thrust at yield, and UTS failure. Also, what happens to my customer with each. Do they get a bolt in the face? </p><p>That probably requires firing one at the uts point and seeing if the case ruptures before you get a bolt in the eye.</p><p></p><p>Then of course, I need to test 1 million cycles of bolt thrust.</p><p></p><p>Are these custom action makers doing this? If not, what is the work around? I never see much evidence.</p><p></p><p>That said, I never chase blowing up my gun.</p><p></p><p>Back to the OP…..these hard bolt lift, ejector swipe, primer crater, brass marks…..those are all in the elastic zone of stress/strain for the action. You are pretty safe here for a few rounds, unless you have some kind of abnormal failure.</p><p></p><p>That said, don't load until you get gas in the eye, split cases or have to hammer a bolt open. Read the early signs and react to them.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2875850, member: 1951"] That is an interesting statement and I’ll take you at your word about this 200000 psi yield strength. That said, I think you have a point here. I’m not an action designer, but if I were, I would design the action to handle bolt thrust as a fatigue loading. Ideally since a barrel is a pressure vessel loaded in a fatigue loading. I would look at is from a UTS standpoint, wanting a factor of safety of 4 for a largest diameter bolt face loaded by a 65000 psi cartridge. I would also consider fatigue whose analysis usually work around a 1 million cycle consideration….which tend to be close to a FOS or 4. Of course you have to test. I guess I would have to pay someone with an Instron to test for single force loading to tell me bolt thrust at yield, and UTS failure. Also, what happens to my customer with each. Do they get a bolt in the face? That probably requires firing one at the uts point and seeing if the case ruptures before you get a bolt in the eye. Then of course, I need to test 1 million cycles of bolt thrust. Are these custom action makers doing this? If not, what is the work around? I never see much evidence. That said, I never chase blowing up my gun. Back to the OP…..these hard bolt lift, ejector swipe, primer crater, brass marks…..those are all in the elastic zone of stress/strain for the action. You are pretty safe here for a few rounds, unless you have some kind of abnormal failure. That said, don’t load until you get gas in the eye, split cases or have to hammer a bolt open. Read the early signs and react to them. [/QUOTE]
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Reloading
Hidden Pressure Reading: A Method
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