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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: 531569" data-attributes="member: 25383"><p>that bright ring is just ahead of the belt. That's where the case will see it's max pressure. Also the ring runs all the way around the case. Normaly a reamer going south will simply not cut well. Actually a dull reamer often cuts a more accurate hole than a recently ground one. Bad spindle bearings will also effect the finish, but those lines usually run parallel with the axis of the reamer. The dead give away here is the O.D. measurments the poster supplied. The case has expanded several thousandths at the pressure ring area. A normal sizing die has a hard time sizing that area, if it can at all. That's why I suggested a visit with Larry Willis.</p><p> </p><p>I have polished a few chambers in the past with an oil slurrey I made up using light spindle oil (like three in one), and powdered cleaner like Comet. Use a hard maple dowl about four inches long. First polish the chamber with 400 grit black paper wrapped around a wood dowl. Then use the slurrey. If you really want it slick, then after the Comet, try corn starch & oil, and then later dry. It'll look like a mirror. There is an even better compound out there, but think it's illeagle in the U.S. these days</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 531569, member: 25383"] that bright ring is just ahead of the belt. That's where the case will see it's max pressure. Also the ring runs all the way around the case. Normaly a reamer going south will simply not cut well. Actually a dull reamer often cuts a more accurate hole than a recently ground one. Bad spindle bearings will also effect the finish, but those lines usually run parallel with the axis of the reamer. The dead give away here is the O.D. measurments the poster supplied. The case has expanded several thousandths at the pressure ring area. A normal sizing die has a hard time sizing that area, if it can at all. That's why I suggested a visit with Larry Willis. I have polished a few chambers in the past with an oil slurrey I made up using light spindle oil (like three in one), and powdered cleaner like Comet. Use a hard maple dowl about four inches long. First polish the chamber with 400 grit black paper wrapped around a wood dowl. Then use the slurrey. If you really want it slick, then after the Comet, try corn starch & oil, and then later dry. It'll look like a mirror. There is an even better compound out there, but think it's illeagle in the U.S. these days gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
7mm STW - Stuck cases, at wits end
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