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Rifles, Reloading, Optics, Equipment
Reloading
Flattened Primers
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<blockquote data-quote="Trickymissfit" data-source="post: 716917" data-attributes="member: 25383"><p>read the thread again, and there's some interesting points being made. Over the years I have seen two rifles that came from the factory with a "dish" in the bolt head. Not much, but three or four thousandths dish in them. Being as the original poster has taken his rifle to someone that knows his business (Hart), we have to assume that the chamber is to spec because they said it was. That brings us back to square one again.</p><p> </p><p>Normally a flattened primer is a sign of a few things happening after initial ignition of the primer:</p><p>1. Excessive pressures</p><p>2. loose primer pockets</p><p>3. with reference to excessive pressures, has the loader actually did an accurate inspection of the cases after firing? Could the grip on the bullet be excessively tight? Maybe one hell of a doughnut in the base of the neck? Or maybe the neck has expanded to the point that it is less than .0025" smaller than the chamber neck?</p><p> </p><p>I have seen the wrong powder dumped in a bottle from the factory a couple times, but this is very rare and was easilly noticeable in the cases I saw. His loads are far enough down the load scale that even his measurer would still be in a safe range, so I think we can forget that as well.</p><p> </p><p>Is it possible that the throat is so contaminated that it's causing a pressure spike? Is the chamber actually inline with the bore and also concentric with the bore. (I have seen this more than once) </p><p> </p><p>Try this check:</p><p>lay a strip of masking tape along the barrel lengthwise. Run a very tight patch (lubed) thru the barrel with a good quality jag (I prefer Proshot). Mark on the tape the locations of the tight spots and where it loosens up. If you happen to start out with a very tight place in the area just after the throat you may have a problem. I have seen burrs left from reaming the chambers here, and that will cause an excessive pressure spike. You can take the further by "slugging" the barrel.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 716917, member: 25383"] read the thread again, and there's some interesting points being made. Over the years I have seen two rifles that came from the factory with a "dish" in the bolt head. Not much, but three or four thousandths dish in them. Being as the original poster has taken his rifle to someone that knows his business (Hart), we have to assume that the chamber is to spec because they said it was. That brings us back to square one again. Normally a flattened primer is a sign of a few things happening after initial ignition of the primer: 1. Excessive pressures 2. loose primer pockets 3. with reference to excessive pressures, has the loader actually did an accurate inspection of the cases after firing? Could the grip on the bullet be excessively tight? Maybe one hell of a doughnut in the base of the neck? Or maybe the neck has expanded to the point that it is less than .0025" smaller than the chamber neck? I have seen the wrong powder dumped in a bottle from the factory a couple times, but this is very rare and was easilly noticeable in the cases I saw. His loads are far enough down the load scale that even his measurer would still be in a safe range, so I think we can forget that as well. Is it possible that the throat is so contaminated that it's causing a pressure spike? Is the chamber actually inline with the bore and also concentric with the bore. (I have seen this more than once) Try this check: lay a strip of masking tape along the barrel lengthwise. Run a very tight patch (lubed) thru the barrel with a good quality jag (I prefer Proshot). Mark on the tape the locations of the tight spots and where it loosens up. If you happen to start out with a very tight place in the area just after the throat you may have a problem. I have seen burrs left from reaming the chambers here, and that will cause an excessive pressure spike. You can take the further by "slugging" the barrel. gary [/QUOTE]
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