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The Basics, Starting Out
gibbs mauser build, lots of questions
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 435382" data-attributes="member: 505"><p>I have all the gibbs from 240 to 338 except the 270. I love the gibbs line. They are virtually the same performance as the standard magnum counterparts. Since you have 30-06 brass I would do the 7mm or 6.5 gibbs. The reason is your brass needs to be one caliber larger than your finished product for headspace. You neck the brass down until it just chambers easily and that is your headspace and where you fire form it. Use 25-06 for the 240. My velocities with the 7mm gibbs are the same as the listed velocities for the 7mm rem mag in the loading manuals. My 30 Gibbs velocities are about the same as the published loads for the 300 win mag. If you want to do it get an 8mm expander ball and run the cases in it first. Then size back down to 30 cal until it chambers then set your die. There is your headspace for fireforming. If you plan on shooting it quite a bit do the 7mm or the 30 cal. The 240 and 6.5 will be shorter barrel life. The 240 gibbs is a monster in 6mm and is the fastest 6mm in my arsenal. I have some loads over 4300 fps for it.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 435382, member: 505"] I have all the gibbs from 240 to 338 except the 270. I love the gibbs line. They are virtually the same performance as the standard magnum counterparts. Since you have 30-06 brass I would do the 7mm or 6.5 gibbs. The reason is your brass needs to be one caliber larger than your finished product for headspace. You neck the brass down until it just chambers easily and that is your headspace and where you fire form it. Use 25-06 for the 240. My velocities with the 7mm gibbs are the same as the listed velocities for the 7mm rem mag in the loading manuals. My 30 Gibbs velocities are about the same as the published loads for the 300 win mag. If you want to do it get an 8mm expander ball and run the cases in it first. Then size back down to 30 cal until it chambers then set your die. There is your headspace for fireforming. If you plan on shooting it quite a bit do the 7mm or the 30 cal. The 240 and 6.5 will be shorter barrel life. The 240 gibbs is a monster in 6mm and is the fastest 6mm in my arsenal. I have some loads over 4300 fps for it. [/QUOTE]
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The Basics, Starting Out
gibbs mauser build, lots of questions
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