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Need Help - Sticky Bolt
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<blockquote data-quote="Brent" data-source="post: 5984" data-attributes="member: 99"><p>IMHO, pressure is too high on both loadings. The first ones were "most likely" FL sized and bolt thrust was ALOT less. If you neck sized or Partial FL sized for minimal headspace on the "next" ones, you just increased the bolt thrust ALOT, only now the brass flowed into the ejector hole/slot where it hadn't before, the case body gripped the chamber wall and lessened the casehead pressure setting it back into the boltface. </p><p></p><p>This is where your difficult camming action is coming from, the shearing off of the brass in the ejector hole... hense the shinny "spot" you might see on the case head. The increase in overall bolt lift is "tight headspace" and/or heavy web expansion.... FL sizing will make em all better though. <img src="http://images/icons/wink.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Primer pockets will likely suffer if you stay at that load...</p><p></p><p>Back off the load a couple grains would be my suggestion, psi should come down 3-5k and you should be ok and keep your brass healthy. </p><p></p><p>Just curious, are you using Retumbo on those?</p></blockquote><p></p>
[QUOTE="Brent, post: 5984, member: 99"] IMHO, pressure is too high on both loadings. The first ones were "most likely" FL sized and bolt thrust was ALOT less. If you neck sized or Partial FL sized for minimal headspace on the "next" ones, you just increased the bolt thrust ALOT, only now the brass flowed into the ejector hole/slot where it hadn't before, the case body gripped the chamber wall and lessened the casehead pressure setting it back into the boltface. This is where your difficult camming action is coming from, the shearing off of the brass in the ejector hole... hense the shinny "spot" you might see on the case head. The increase in overall bolt lift is "tight headspace" and/or heavy web expansion.... FL sizing will make em all better though. [img]images/icons/wink.gif[/img] Primer pockets will likely suffer if you stay at that load... Back off the load a couple grains would be my suggestion, psi should come down 3-5k and you should be ok and keep your brass healthy. Just curious, are you using Retumbo on those? [/QUOTE]
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