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Rifles, Reloading, Optics, Equipment
Reloading
Some brass not bumping back
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<blockquote data-quote="KsKevin" data-source="post: 2870753" data-attributes="member: 116689"><p>I've had rifles where I ended up measuring headspace using a different comparator die than the cartridge spec calls for as it gave the most consistent indication of chamber fit. </p><p></p><p>For example, a 280ai is headspace spec'd off the 0.375" datum line. Chambering all the new unfired brass before loading (ejector and firing pin removed) I sort all brass into chambers 'zero resitance', very slight resistance, slight resistance. I then measured all using both 0.375" and 0.400" comparators. What I've found is there were overlaps in headspace using 0.375" comparator as to how they chambered but when I looked at 0.400" comparator measurements it was much more consistent as to predicting which ones chambered easily vs slight resistance. Redid same exercise with the once fired brass and again found same outcome. </p><p></p><p>If the ones that you have with a bit longer headspace are chambering ok, perhaps try measuring all with a different comparator to see if they are more consistent and better predicts chamber fit.</p></blockquote><p></p>
[QUOTE="KsKevin, post: 2870753, member: 116689"] I’ve had rifles where I ended up measuring headspace using a different comparator die than the cartridge spec calls for as it gave the most consistent indication of chamber fit. For example, a 280ai is headspace spec’d off the 0.375” datum line. Chambering all the new unfired brass before loading (ejector and firing pin removed) I sort all brass into chambers ‘zero resitance’, very slight resistance, slight resistance. I then measured all using both 0.375” and 0.400” comparators. What I’ve found is there were overlaps in headspace using 0.375” comparator as to how they chambered but when I looked at 0.400” comparator measurements it was much more consistent as to predicting which ones chambered easily vs slight resistance. Redid same exercise with the once fired brass and again found same outcome. If the ones that you have with a bit longer headspace are chambering ok, perhaps try measuring all with a different comparator to see if they are more consistent and better predicts chamber fit. [/QUOTE]
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Reloading
Some brass not bumping back
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