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Fire forming 30 gibbs
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<blockquote data-quote="Guest" data-source="post: 11952"><p>A Carlson,</p><p></p><p>I have 5 drawings of the 30 Gibbs and they are all different from each other. The implication is that there are probably at least as many different chamber reamer drawings as well. Cast your chamber and get someone with lots of reloading experience to assist you as you get started with the 30 Gibbs. </p><p></p><p>If you use 30-06 cases, you should neck them up to .338 first then neck them back down to 30 caliber a bit at a time to create a false shoulder. Check the case for a tight (crush) fit as the bolt is closed. Lock your sizing die at this point.</p><p></p><p>An article by Roger Stowers in "Wildcat Cartridges", states that with a 180 grain bullet seated firmly into the lands, a load of 50 grains of IMR-4895 will create the right amount of pressure to fill out the sharp shouldered case. </p><p></p><p>The illustration of the Gibbs below, I think is incorrect. The shoulder per Rocky Gibbs was set at a 35 degree angle. The overall length is short as compared to my other drawings, also. It just points out that there are differences between sources and they need to be checked. </p><p></p><p></p><p> <img src="http://img.photobucket.com/albums/v442/wp4qjm7dh/30-06Springfield.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p> <img src="http://img.photobucket.com/albums/v442/wp4qjm7dh/30Gibbs.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>[ 09-11-2004: Message edited by: Crispin Goodall ]</p><p></p><p>[ 09-11-2004: Message edited by: Crispin Goodall ]</p></blockquote><p></p>
[QUOTE="Guest, post: 11952"] A Carlson, I have 5 drawings of the 30 Gibbs and they are all different from each other. The implication is that there are probably at least as many different chamber reamer drawings as well. Cast your chamber and get someone with lots of reloading experience to assist you as you get started with the 30 Gibbs. If you use 30-06 cases, you should neck them up to .338 first then neck them back down to 30 caliber a bit at a time to create a false shoulder. Check the case for a tight (crush) fit as the bolt is closed. Lock your sizing die at this point. An article by Roger Stowers in "Wildcat Cartridges", states that with a 180 grain bullet seated firmly into the lands, a load of 50 grains of IMR-4895 will create the right amount of pressure to fill out the sharp shouldered case. The illustration of the Gibbs below, I think is incorrect. The shoulder per Rocky Gibbs was set at a 35 degree angle. The overall length is short as compared to my other drawings, also. It just points out that there are differences between sources and they need to be checked. [img]http://img.photobucket.com/albums/v442/wp4qjm7dh/30-06Springfield.gif[/img] [img]http://img.photobucket.com/albums/v442/wp4qjm7dh/30Gibbs.gif[/img] [ 09-11-2004: Message edited by: Crispin Goodall ] [ 09-11-2004: Message edited by: Crispin Goodall ] [/QUOTE]
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