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Rifles, Reloading, Optics, Equipment
Reloading
Once-fired shorter?
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<blockquote data-quote="MagnumManiac" data-source="post: 1100136" data-attributes="member: 10755"><p>There is NO POINT using a factory case as a reference, only worry about the dimensions of your fired cases. Once fired brass is NOT a good indicator of your rifle chambers dimensions, it takes at least 3 full pressure loads to get brass to fully fill the chamber, the reason is due to 'springback'. New brass is more elastic and will have the most amount of springback over it's life time.</p><p>I have a few rifles with absolute minimum or below SAAMI chambers, resizing this brass takes another thought process. When sizing, a case grows longer just before the shoulder is bumped, if the die is too long, it won't size the case enough and hard chambering will ensue. Using a feeler guage between the case head and shellholder overcomes this problem.</p><p>If you neck size for 3-4 firings only, then measure your fired cases, it should give you a good chamber measurement, if still under SAAMI, you'll have to experiment with the right feeler guage size to get your cases 'just right'. Once determined, buy another shell holder and have the TOP of it reduced by the amount you measured it took to size your brass correctly.</p><p></p><p>Cheers.</p><p>lightbulb</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1100136, member: 10755"] There is NO POINT using a factory case as a reference, only worry about the dimensions of your fired cases. Once fired brass is NOT a good indicator of your rifle chambers dimensions, it takes at least 3 full pressure loads to get brass to fully fill the chamber, the reason is due to 'springback'. New brass is more elastic and will have the most amount of springback over it's life time. I have a few rifles with absolute minimum or below SAAMI chambers, resizing this brass takes another thought process. When sizing, a case grows longer just before the shoulder is bumped, if the die is too long, it won't size the case enough and hard chambering will ensue. Using a feeler guage between the case head and shellholder overcomes this problem. If you neck size for 3-4 firings only, then measure your fired cases, it should give you a good chamber measurement, if still under SAAMI, you'll have to experiment with the right feeler guage size to get your cases 'just right'. Once determined, buy another shell holder and have the TOP of it reduced by the amount you measured it took to size your brass correctly. Cheers. lightbulb [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Once-fired shorter?
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