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Rifles, Reloading, Optics, Equipment
Reloading
A must have for every reloader
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<blockquote data-quote="Howland" data-source="post: 1391174" data-attributes="member: 103509"><p>Hornady doesn't have to because SAAMI does. For instance the headspace for .308 Winchester is that point on the shoulder that is .400" in diameter. It is about halfway on the shoulder. Measuring from cartridge base to that point on a fully fireformed case (you would use the 0.40" insert) will tell you the exact headspace of your chamber, that way you can adjust your sizing die to consistently set the shoulder back only 1 or 2 thousanths to ensure proper feeding without setting it back too much and overworking the brass. The chamber specifications show the chamber headspace to be 1.630-1.640" from the bolt face. Longer or shorter is out of spec.</p><p></p><p>Didn't someone post the link earlier in this thread for the SAAMI chamber and cartridge dimension specifications?</p><p></p><p>Edit: Same discussion but a different forum. Here is the SAAMI specifications page. You want the cartridge and chamber drawings link. It's a 10M, 375 page PDF file with I think all but the newest wildcats. Just out of curiosity, what cartridge are you looking for the headspace specs for?</p><p></p><p><a href="http://www.saami.org/specifications_and_information/index.cfm" target="_blank">http://www.saami.org/specifications_and_information/index.cfm</a></p></blockquote><p></p>
[QUOTE="Howland, post: 1391174, member: 103509"] Hornady doesn't have to because SAAMI does. For instance the headspace for .308 Winchester is that point on the shoulder that is .400” in diameter. It is about halfway on the shoulder. Measuring from cartridge base to that point on a fully fireformed case (you would use the 0.40" insert) will tell you the exact headspace of your chamber, that way you can adjust your sizing die to consistently set the shoulder back only 1 or 2 thousanths to ensure proper feeding without setting it back too much and overworking the brass. The chamber specifications show the chamber headspace to be 1.630-1.640" from the bolt face. Longer or shorter is out of spec. Didn't someone post the link earlier in this thread for the SAAMI chamber and cartridge dimension specifications? Edit: Same discussion but a different forum. Here is the SAAMI specifications page. You want the cartridge and chamber drawings link. It's a 10M, 375 page PDF file with I think all but the newest wildcats. Just out of curiosity, what cartridge are you looking for the headspace specs for? [URL]http://www.saami.org/specifications_and_information/index.cfm[/URL] [/QUOTE]
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A must have for every reloader
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