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Rifles, Reloading, Optics, Equipment
Reloading
Pressure Signs Please Help
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<blockquote data-quote="yawn" data-source="post: 498689" data-attributes="member: 13540"><p>Ok my thoughts are that a 180vld @ 3000fps from a 24"barrel seems to be getting up there but I dont know what load or even what chrono you are using. The signs you mention are not the typical over pressure signs you would see. Generally primers may flatten, bolt lift will get sticky (from the initial lift not just the last stage) the brass may flow from the case head into the ejector/plunger giving a shiny spot on the case head ( not the ring you mentioned thast moer of a sizing thing as well) primer pockets will loosen along with a few others. You dont apear to have any of the above.When the pressues get near max everything has to be just right for proper functioning. Im thinking there may be a die to chamber relationship problem thats not quite sizing the case enough to allow extraction after firing .The hard lift at the top of the bolt throw (sometimes called bolt click) is the first stage of extraction, if the chamber is tight and the die just a little large then this can be the result. I had this problem a year or so ago, the symtoms where exactly the same. . In my case the Redding FL match die was exactly the same size as the chamber so it wasnt sizing the bottom of the case at all.A thou out of the rear of the chamber and no more prblem. </p><p> You can drop the charge back to a point where it will function or get the die and chamber measured with some pin guages or maybe try a small base die.Sometimes even just another FL die will be enough.</p><p> Something to think about anyway.</p></blockquote><p></p>
[QUOTE="yawn, post: 498689, member: 13540"] Ok my thoughts are that a 180vld @ 3000fps from a 24"barrel seems to be getting up there but I dont know what load or even what chrono you are using. The signs you mention are not the typical over pressure signs you would see. Generally primers may flatten, bolt lift will get sticky (from the initial lift not just the last stage) the brass may flow from the case head into the ejector/plunger giving a shiny spot on the case head ( not the ring you mentioned thast moer of a sizing thing as well) primer pockets will loosen along with a few others. You dont apear to have any of the above.When the pressues get near max everything has to be just right for proper functioning. Im thinking there may be a die to chamber relationship problem thats not quite sizing the case enough to allow extraction after firing .The hard lift at the top of the bolt throw (sometimes called bolt click) is the first stage of extraction, if the chamber is tight and the die just a little large then this can be the result. I had this problem a year or so ago, the symtoms where exactly the same. . In my case the Redding FL match die was exactly the same size as the chamber so it wasnt sizing the bottom of the case at all.A thou out of the rear of the chamber and no more prblem. You can drop the charge back to a point where it will function or get the die and chamber measured with some pin guages or maybe try a small base die.Sometimes even just another FL die will be enough. Something to think about anyway. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Pressure Signs Please Help
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