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Rifles, Reloading, Optics, Equipment
Reloading
primer seating question
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<blockquote data-quote="MagnumManiac" data-source="post: 914529" data-attributes="member: 10755"><p>I cannot see how the case head can 'bulge' from seating a primer, it's not possible as far as I am aware. I believe the primer is high and giving you a false reading.</p><p>All primers are designed to not only bottom out in the primer pocket, but also to push the anvil into the cup until it is also flush with the bottom of the cup, this gives the priming mix a slight pre ignition squish and sets up the primer to take the full hit from the firing pin, if it isn't flush, some of the firing pin energy is absorbed by the primer being seated further into the cup, it is necessary for the primer to be seated .003"-.005" below flush for the above factors to be present. </p><p>Some primer and case combo's are just harder to seat, if the primer is still high you will have to reseat it until it is below flush. </p><p>I have this problem with Norma cases and Federal primers, but Winchester primers don't seat as hard and bottom out without having to use excessive force.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 914529, member: 10755"] I cannot see how the case head can 'bulge' from seating a primer, it's not possible as far as I am aware. I believe the primer is high and giving you a false reading. All primers are designed to not only bottom out in the primer pocket, but also to push the anvil into the cup until it is also flush with the bottom of the cup, this gives the priming mix a slight pre ignition squish and sets up the primer to take the full hit from the firing pin, if it isn't flush, some of the firing pin energy is absorbed by the primer being seated further into the cup, it is necessary for the primer to be seated .003"-.005" below flush for the above factors to be present. Some primer and case combo's are just harder to seat, if the primer is still high you will have to reseat it until it is below flush. I have this problem with Norma cases and Federal primers, but Winchester primers don't seat as hard and bottom out without having to use excessive force. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
primer seating question
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