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Rifles, Reloading, Optics, Equipment
Reloading
Deep primer pocket
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<blockquote data-quote="MagnumManiac" data-source="post: 2116466" data-attributes="member: 10755"><p>Interesting, numbers thrown about but no ACTUAL measurements.</p><p>Measure the depth of the pocket, seat a primer as far as your tool will seat it, punch it out (carefully) and measure it, then measure a new unseated primer, compare the measurements. Measure the pin protrusion on your bolt.</p><p>All measurements on primers need to be taken and compared with a seated primer that has the anvil flush with the cup and NO crush. Then you can determine depth below flush required and the amount of crush or pre-tension. I like .003"-.004" of crush AFTER the cup and anvil are flush with the pocket bottom.</p><p>Primers NEED this tension to perform correctly, if seated high and without crush, the energy from the firing pin is used to seat the primer deeper and/or crush the cup against the anvil further. This causes erratic ignition.</p><p>I have even seen Eric Cortina take zero notice of how he was priming cases. If it goes bang, then all good??</p><p>Not for me, the primer is where it's at, it governs HOW your load is going to work and even the type needs to be tested when developing loads.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2116466, member: 10755"] Interesting, numbers thrown about but no ACTUAL measurements. Measure the depth of the pocket, seat a primer as far as your tool will seat it, punch it out (carefully) and measure it, then measure a new unseated primer, compare the measurements. Measure the pin protrusion on your bolt. All measurements on primers need to be taken and compared with a seated primer that has the anvil flush with the cup and NO crush. Then you can determine depth below flush required and the amount of crush or pre-tension. I like .003”-.004” of crush AFTER the cup and anvil are flush with the pocket bottom. Primers NEED this tension to perform correctly, if seated high and without crush, the energy from the firing pin is used to seat the primer deeper and/or crush the cup against the anvil further. This causes erratic ignition. I have even seen Eric Cortina take zero notice of how he was priming cases. If it goes bang, then all good?? Not for me, the primer is where it’s at, it governs HOW your load is going to work and even the type needs to be tested when developing loads. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Deep primer pocket
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