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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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<blockquote data-quote="25WSM" data-source="post: 1851332" data-attributes="member: 38048"><p>First off you can't get a headspace length by casting a chamber. It only shows you the actual chamber and not the rest of the space back to the bolt face. 2nd if you shoot off just a primer your case is going to be around . 003 to . 007 shorter after the firing pin strike. With no pressure in the case to expand it back you now have a short case. Remember firing pin springs are around 26 pounds on average and yes they will set your brass back. I've built rifles for 30 yrs and shot compatition for half that and never have I felt that I needed to know my exact chamber length. For reloading purposes you just need a fired case and a comparitor. Even if you get a sloppy job and your chamber is . 002 to . 003 too long it doesn't matter that much as long as you set your sizing die up correctly. If you really need to know what the size of your chamber is just neck size for about 3 to 4 shots and when your brass starts to close with a slight resistance you have it. That's the problem with neck sizing after a few shots your brass fit to tight.</p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1851332, member: 38048"] First off you can't get a headspace length by casting a chamber. It only shows you the actual chamber and not the rest of the space back to the bolt face. 2nd if you shoot off just a primer your case is going to be around . 003 to . 007 shorter after the firing pin strike. With no pressure in the case to expand it back you now have a short case. Remember firing pin springs are around 26 pounds on average and yes they will set your brass back. I've built rifles for 30 yrs and shot compatition for half that and never have I felt that I needed to know my exact chamber length. For reloading purposes you just need a fired case and a comparitor. Even if you get a sloppy job and your chamber is . 002 to . 003 too long it doesn't matter that much as long as you set your sizing die up correctly. If you really need to know what the size of your chamber is just neck size for about 3 to 4 shots and when your brass starts to close with a slight resistance you have it. That's the problem with neck sizing after a few shots your brass fit to tight. Shep [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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