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Pressure question?
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<blockquote data-quote="James Jones" data-source="post: 133551" data-attributes="member: 8843"><p>No its not realy a safety issue unless your firing pin is over protruding in which case you might pierce a primer if they are soft but than can happen with any firing pin it it sticks out to far. A pierced primer will scare the hell out of you and probably get you face full of gas and grit (another reason to wear glasses!!) but generaly no serious damaged is caused to you or your gun.</p><p></p><p>This whole topic brings out some very good points that alot of guys should pay attention to especialy with a custom gun.</p><p>When a gun is built correctly , everything is very tight and true in most case the max allowable run out is.0002". Your chamber is likly cut glass smooth and a bit tighter than factory , the bolt and barrel mate the case perfectly , the firing pin has next to no gap to allow primer flow(cratering). All these things make seeing the general pressure signs a bit harder to detect , it'll take a good bit more pressure to cause sticky bolt lift , you primers may not crater at all only flatten out and some primeres are alot harder than others and won't flatten till the pressure is WAY to high.</p><p>So this brings us to our good friend the chrongraph , if your running loads out of you gun that are higher than the listed specs in load books then your probably in the high pressure range , if they are alot faster then your flirting with dissaster. Thats why I reccomend the chronograph and case expansion and life as the best pressure signs. Builders like Kirby that desgine their own rounds and don't realy know what kind of velocity to expect due to no previous data are in my oppinion very brave and I'm sure that they take their sweet time working up their loads an=d spend alot of time with a mic checking things.</p><p>Alot of folks don't relize that once your running a gun in the 65,000-70,000 psi range that it takes very little powder or change in seating depth to make a giant jump in pressure which can cost you your life or at a minimum some eye site and face. Anybody that ahs seen the pics of a gun that was over stressed and come apart knows what I'm talking about. I have seen a custom built Rem 700 in </p><p>22-250 , shoot great with a load that was well above max actualy out running some Swift loads and worked fine in the 40 deg spring but when it was shot the next time it was 90+ degs and the first round galled the bolt into the action and the reciever cracked length wise accross the top bewteen the scopebase holes. I would have liked to seen that load shot accross the chronograph just get an idea of the pressure.</p><p></p><p>Sorry to jack your post RidgeRooster , I just figured that this might pretain here</p></blockquote><p></p>
[QUOTE="James Jones, post: 133551, member: 8843"] No its not realy a safety issue unless your firing pin is over protruding in which case you might pierce a primer if they are soft but than can happen with any firing pin it it sticks out to far. A pierced primer will scare the hell out of you and probably get you face full of gas and grit (another reason to wear glasses!!) but generaly no serious damaged is caused to you or your gun. This whole topic brings out some very good points that alot of guys should pay attention to especialy with a custom gun. When a gun is built correctly , everything is very tight and true in most case the max allowable run out is.0002". Your chamber is likly cut glass smooth and a bit tighter than factory , the bolt and barrel mate the case perfectly , the firing pin has next to no gap to allow primer flow(cratering). All these things make seeing the general pressure signs a bit harder to detect , it'll take a good bit more pressure to cause sticky bolt lift , you primers may not crater at all only flatten out and some primeres are alot harder than others and won't flatten till the pressure is WAY to high. So this brings us to our good friend the chrongraph , if your running loads out of you gun that are higher than the listed specs in load books then your probably in the high pressure range , if they are alot faster then your flirting with dissaster. Thats why I reccomend the chronograph and case expansion and life as the best pressure signs. Builders like Kirby that desgine their own rounds and don't realy know what kind of velocity to expect due to no previous data are in my oppinion very brave and I'm sure that they take their sweet time working up their loads an=d spend alot of time with a mic checking things. Alot of folks don't relize that once your running a gun in the 65,000-70,000 psi range that it takes very little powder or change in seating depth to make a giant jump in pressure which can cost you your life or at a minimum some eye site and face. Anybody that ahs seen the pics of a gun that was over stressed and come apart knows what I'm talking about. I have seen a custom built Rem 700 in 22-250 , shoot great with a load that was well above max actualy out running some Swift loads and worked fine in the 40 deg spring but when it was shot the next time it was 90+ degs and the first round galled the bolt into the action and the reciever cracked length wise accross the top bewteen the scopebase holes. I would have liked to seen that load shot accross the chronograph just get an idea of the pressure. Sorry to jack your post RidgeRooster , I just figured that this might pretain here [/QUOTE]
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