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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.30 GIBBS is finally ready ...
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<blockquote data-quote="nicholasjohn" data-source="post: 1899996" data-attributes="member: 109113"><p>I have a 30-06 AI that was originally chambered with excessive headspace. This is a situation that is similar to a properly chambered 30 Gibbs in some respects. I was attempting to fire-form 30-06 factory loads, and several of them didn't even fire. After thinking about it for a little while, I thought that maybe I was lucky they didn't fire, and the ones that did go bang were where my potential for trouble lies. Well, I expanded the necks with an 8mm Sinclair expander mandrel, and then necked them back down for .308" bullets, leaving the head-spacing shoulder on the brass. This worked perfectly, and all was well. This got me through one hunting season, and then I got the gun fixed properly. </p><p></p><p>The band-aid fix I used in the interim taught me a couple of things : One, the extractor on a Model 70 Winchester won't hold the cartridge case head against the bolt face well enough for safe fire-forming. Two, neither did jamming the bullets into the lands. ( Looking back on this, I probably didn't have enough neck tension, and that may very well be why.) Lastly, if I was going to work with a wildcat that involves moving the shoulder forward, I would do exactly what you're doing here and get all the input I can from guys who have done it before. That way, you can sift through all the information and forge ahead with your project knowing what you're getting into. You're probably going to get what you want out of this endeavor, and you're going to have fun doing it. When you're done, everybody else on this forum is going to be having a ball with your write-up of the process.</p></blockquote><p></p>
[QUOTE="nicholasjohn, post: 1899996, member: 109113"] I have a 30-06 AI that was originally chambered with excessive headspace. This is a situation that is similar to a properly chambered 30 Gibbs in some respects. I was attempting to fire-form 30-06 factory loads, and several of them didn't even fire. After thinking about it for a little while, I thought that maybe I was lucky they didn't fire, and the ones that did go bang were where my potential for trouble lies. Well, I expanded the necks with an 8mm Sinclair expander mandrel, and then necked them back down for .308" bullets, leaving the head-spacing shoulder on the brass. This worked perfectly, and all was well. This got me through one hunting season, and then I got the gun fixed properly. The band-aid fix I used in the interim taught me a couple of things : One, the extractor on a Model 70 Winchester won't hold the cartridge case head against the bolt face well enough for safe fire-forming. Two, neither did jamming the bullets into the lands. ( Looking back on this, I probably didn't have enough neck tension, and that may very well be why.) Lastly, if I was going to work with a wildcat that involves moving the shoulder forward, I would do exactly what you're doing here and get all the input I can from guys who have done it before. That way, you can sift through all the information and forge ahead with your project knowing what you're getting into. You're probably going to get what you want out of this endeavor, and you're going to have fun doing it. When you're done, everybody else on this forum is going to be having a ball with your write-up of the process. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.30 GIBBS is finally ready ...
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