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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
The widely unknown and forgotten marlin mr-7 - building a mountain rifle in .270 sherman
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<blockquote data-quote="codyadams" data-source="post: 1732089" data-attributes="member: 87243"><p>Once we found the proper procedure to create the false shoulder, it was extremely simple. Neck up to 30 cal using an expander ball in a 30-06 die we had on hand, then we simply ran them all the way up into a standard non bushing 7mm rem mag die without the expander ball, dump powder and seat bullet. </p><p></p><p>Since the 7mm die is a non bushing die, it necks down to .275 and relies on the expander ball to bring it up to .282 when you pull the brass out, but without the 7mm expander ball it leaves it at the perfect diameter to hold a .277 bullet, and a 7mm rem mag die also just happens to place the neck/shoulder junction perfectly to create a false shoulder for a nice snug crush fit with the .270 sherman, as pictured below.[ATTACH=full]153274[/ATTACH]</p></blockquote><p></p>
[QUOTE="codyadams, post: 1732089, member: 87243"] Once we found the proper procedure to create the false shoulder, it was extremely simple. Neck up to 30 cal using an expander ball in a 30-06 die we had on hand, then we simply ran them all the way up into a standard non bushing 7mm rem mag die without the expander ball, dump powder and seat bullet. Since the 7mm die is a non bushing die, it necks down to .275 and relies on the expander ball to bring it up to .282 when you pull the brass out, but without the 7mm expander ball it leaves it at the perfect diameter to hold a .277 bullet, and a 7mm rem mag die also just happens to place the neck/shoulder junction perfectly to create a false shoulder for a nice snug crush fit with the .270 sherman, as pictured below.[ATTACH=full]153274[/ATTACH] [/QUOTE]
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The widely unknown and forgotten marlin mr-7 - building a mountain rifle in .270 sherman
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