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Rifles, Reloading, Optics, Equipment
Reloading
Why such varying headspace measurement on fired cases
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<blockquote data-quote="Chas1" data-source="post: 1517879" data-attributes="member: 15738"><p>Cases in question are 308 FC factory loaded ammo once fired in same bolt action rifle. Using a Wilson case gauge the 67 once fired cases measure as follows:</p><p></p><p>14 cases @ 1.630</p><p>27 cases @ 1.631</p><p>17 cases @ 1.632</p><p> 2 cases @ 1.633</p><p> 3 cases @ 1.634</p><p> 2 cases @ 1.635</p><p> 1 case @ 1.636</p><p> 1 case @ 1.638 </p><p></p><p></p><p>That's a .008 headspace variance on cases fired and extracted from the same rifle. Can anyone offer any explanation on why such a widespread variance...is this normal ? I do see that most cases (86%) fall pretty close (1.630 - 1.632)...any thoughts ? Lastly if I were to bump shoulders back by typical .002 then I'd have cases that would span 1.628 - 1.636 that doesn't seem to make sense given the chamber is a fixed measurement and I would think that one would want all cases to have same headspacing...so am I supposed to just come up with some average headspace number and hope for the best ? Any input would be greatly appreciated, thanks</p></blockquote><p></p>
[QUOTE="Chas1, post: 1517879, member: 15738"] Cases in question are 308 FC factory loaded ammo once fired in same bolt action rifle. Using a Wilson case gauge the 67 once fired cases measure as follows: 14 cases @ 1.630 27 cases @ 1.631 17 cases @ 1.632 2 cases @ 1.633 3 cases @ 1.634 2 cases @ 1.635 1 case @ 1.636 1 case @ 1.638 That's a .008 headspace variance on cases fired and extracted from the same rifle. Can anyone offer any explanation on why such a widespread variance...is this normal ? I do see that most cases (86%) fall pretty close (1.630 - 1.632)...any thoughts ? Lastly if I were to bump shoulders back by typical .002 then I'd have cases that would span 1.628 - 1.636 that doesn't seem to make sense given the chamber is a fixed measurement and I would think that one would want all cases to have same headspacing...so am I supposed to just come up with some average headspace number and hope for the best ? Any input would be greatly appreciated, thanks [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Why such varying headspace measurement on fired cases
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