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Rifles, Reloading, Optics, Equipment
Reloading
Hidden Pressure Reading: A Method
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<blockquote data-quote="RockyMtnMT" data-source="post: 2875827" data-attributes="member: 7999"><p>Then there are those combos or cartridges that create what I call phantom pressure. All the pressure signs with no velocity to go with it. The 6.5 prc is the most blatant example that I know of. If you use magnum primers in it, it will pressure out 250 fps and 4-5g earlier than when loaded with standard lr primers. I believe this comes from too quick of ignition burning too much in the chamber and not enough down the barrel. Low density loads can cause huge pressure issues. These are much more concerning to me than loads with acceptable powders, for the cartridge, that have been taken farther than they should.</p><p></p><p>It is not the end of the world if a loader works up a load to the point of "holy crap that was too much". You have to do very stupid things like go up another 5g past that point of difficulty opening the bolt or even a blown primer. If using a proper powder you shouldn't be able to get to a point of actual danger of catastrophic failure. Reminds me of a story we heard when we visited Wby. A guy called them angry that his Mark V had failed and shot the bolt through his neck. He couldn't believe that Wby had allowed a product on the market could allow this to happen and wanted to know what they were going to do about it. When asked how this happened he admitted that he confused his powder and accidently loaded pistol powder in his 300 Wby mag. He shot it the first time and had to beat the bolt open and knock the spent case out of the chamber before he could fire it again. It finally dawned on this angry man just how stupid he was when he disclosed that it was the ninth shot that caused the bolt to fail and go through his neck. </p><p></p><p>We got to see the procedure of proof loads. They are much higher than accidently working up to a blown primer. They completely fail the brass. But not as high as the dim wit that took 9 shots to drive a bolt through his neck.</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 2875827, member: 7999"] Then there are those combos or cartridges that create what I call phantom pressure. All the pressure signs with no velocity to go with it. The 6.5 prc is the most blatant example that I know of. If you use magnum primers in it, it will pressure out 250 fps and 4-5g earlier than when loaded with standard lr primers. I believe this comes from too quick of ignition burning too much in the chamber and not enough down the barrel. Low density loads can cause huge pressure issues. These are much more concerning to me than loads with acceptable powders, for the cartridge, that have been taken farther than they should. It is not the end of the world if a loader works up a load to the point of "holy crap that was too much". You have to do very stupid things like go up another 5g past that point of difficulty opening the bolt or even a blown primer. If using a proper powder you shouldn't be able to get to a point of actual danger of catastrophic failure. Reminds me of a story we heard when we visited Wby. A guy called them angry that his Mark V had failed and shot the bolt through his neck. He couldn't believe that Wby had allowed a product on the market could allow this to happen and wanted to know what they were going to do about it. When asked how this happened he admitted that he confused his powder and accidently loaded pistol powder in his 300 Wby mag. He shot it the first time and had to beat the bolt open and knock the spent case out of the chamber before he could fire it again. It finally dawned on this angry man just how stupid he was when he disclosed that it was the ninth shot that caused the bolt to fail and go through his neck. We got to see the procedure of proof loads. They are much higher than accidently working up to a blown primer. They completely fail the brass. But not as high as the dim wit that took 9 shots to drive a bolt through his neck. [/QUOTE]
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Hidden Pressure Reading: A Method
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