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Rifles, Reloading, Optics, Equipment
Gunsmithing
7mm STW - Stuck cases, at wits end
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<blockquote data-quote="Trickymissfit" data-source="post: 532097" data-attributes="member: 25383"><p>the head space on a belted magnum is exactly .250." You can set them up to head space off the shoulder, and case head, but the proper way is the belt. If it's a factory chamber or one using a factory type reamer it will head space off the belt unless modified. The headspace being too long will simply not allow the bolt to close. The headspace being too short will create case stretch length ways, and not laterally.</p><p> </p><p> As I said take a brand new case and load the same charge, but about one grain less. See if that works for several loadings. If not, then it's time for a chamber cast. When you touch off the primer and ignite the powder the gasses in the case cause it to expand in all directions. But as the pressure eases the case will retract to where it started from inless you took the metal past it's yield point. The shooter has done this by looking at the O.D. numbers he's posted. I might add here that it's nearly impossable to measure case growth with a conventional micrometer. You at least need a blade mic, and even the width of the blade is still too much. I use both blade mics and a .5135" ring gauge made from a ball bearing with a 13mm I.D. (even an inner race for a 13mm shaft will work very well right out of the box). If the bushing will not slide all the way down the shaft, I know the case needs completely resizing (got a cigar box full of case now)</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 532097, member: 25383"] the head space on a belted magnum is exactly .250." You can set them up to head space off the shoulder, and case head, but the proper way is the belt. If it's a factory chamber or one using a factory type reamer it will head space off the belt unless modified. The headspace being too long will simply not allow the bolt to close. The headspace being too short will create case stretch length ways, and not laterally. As I said take a brand new case and load the same charge, but about one grain less. See if that works for several loadings. If not, then it's time for a chamber cast. When you touch off the primer and ignite the powder the gasses in the case cause it to expand in all directions. But as the pressure eases the case will retract to where it started from inless you took the metal past it's yield point. The shooter has done this by looking at the O.D. numbers he's posted. I might add here that it's nearly impossable to measure case growth with a conventional micrometer. You at least need a blade mic, and even the width of the blade is still too much. I use both blade mics and a .5135" ring gauge made from a ball bearing with a 13mm I.D. (even an inner race for a 13mm shaft will work very well right out of the box). If the bushing will not slide all the way down the shaft, I know the case needs completely resizing (got a cigar box full of case now) gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
7mm STW - Stuck cases, at wits end
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