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Rifles, Reloading, Optics, Equipment
Reloading
To crimp or not to crimp?
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<blockquote data-quote="jwp475" data-source="post: 158055" data-attributes="member: 3776"><p>[ QUOTE ]</p><p>First off,</p><p>I'm new to reloading so i'm trying to figuer it all out with a proper starting platform.(no bad habits)</p><p></p><p>the reason behind me wanting to know about crimping is.I did a load of 75GR of H4831sc and they shot awsome 5 in a quarter.okay on second load of same brass same load I seperated some cases.One came out of gun split around base.the other base came out and main part stayed in the gun.(not fun to get out)My thought was load is to hot.so i droped powder charge and my acuracey went way down.I was thinking cripmping might help.I have tryed all the powder charges from 70 and up.the 75gr was the best i have moved the bullet in and out and still nothing like i want.</p><p>So i was just playing around with the crimping to see if it would help it did some what but still nothing like the first load i did.</p><p></p><p>Do ya'll have any ideas for me to try? </p><p></p><p>[/ QUOTE ]</p><p></p><p></p><p> There are 2 causes for case head seperation.</p><p>1- bumping the shoulder to far back and allow the case to have a head pace problem.How this happens is when the cartridge is fired the pressure sends the case back hard against the bolt and allows for ht case to stretch forward to fill the chamber and the stretch comes from just in front of the case head.A few shots in this manner and you will get case head seperation</p><p></p><p>2- Is caused by a case lenghting and needing continual triming this why many prefer an improved case with a sharp shoulder as they stretch less.Example a 300 H&amp;H case will stretch more than a 300 winn case upon each fireing, becauyse of the shallow should and the sloping case design...</p><p></p><p> Make sure that when the case' are re-sized that the shoulder of the case is against the shoulder area of the chamber and the case head seperation problem will be resolved...............</p></blockquote><p></p>
[QUOTE="jwp475, post: 158055, member: 3776"] [ QUOTE ] First off, I'm new to reloading so i'm trying to figuer it all out with a proper starting platform.(no bad habits) the reason behind me wanting to know about crimping is.I did a load of 75GR of H4831sc and they shot awsome 5 in a quarter.okay on second load of same brass same load I seperated some cases.One came out of gun split around base.the other base came out and main part stayed in the gun.(not fun to get out)My thought was load is to hot.so i droped powder charge and my acuracey went way down.I was thinking cripmping might help.I have tryed all the powder charges from 70 and up.the 75gr was the best i have moved the bullet in and out and still nothing like i want. So i was just playing around with the crimping to see if it would help it did some what but still nothing like the first load i did. Do ya'll have any ideas for me to try? [/ QUOTE ] There are 2 causes for case head seperation. 1- bumping the shoulder to far back and allow the case to have a head pace problem.How this happens is when the cartridge is fired the pressure sends the case back hard against the bolt and allows for ht case to stretch forward to fill the chamber and the stretch comes from just in front of the case head.A few shots in this manner and you will get case head seperation 2- Is caused by a case lenghting and needing continual triming this why many prefer an improved case with a sharp shoulder as they stretch less.Example a 300 H&H case will stretch more than a 300 winn case upon each fireing, becauyse of the shallow should and the sloping case design... Make sure that when the case' are re-sized that the shoulder of the case is against the shoulder area of the chamber and the case head seperation problem will be resolved............... [/QUOTE]
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Reloading
To crimp or not to crimp?
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